Goofs

When Max sets off the sprinkler system in the Sanderson house, he stands directly below it and gets completely drenched. When he runs out of the house, his jacket is totally dry.

After Max lights the candle, and things start to happen within the house, a gust of wind blows Dani's hat off. When she puts the hat back on, her hair has been blown around. When the camera cuts to her again, her hair looks the way it did before she lost her hat.

When Dani first finds her mom at the town hall party, the mom is "vogue-ing" with her right hand on her head and her left hand stretched out. As the camera cuts back and forth between mom and Dani, mom's wedding ring disappears from her left hand.

Sarah Sanderson's hair changes from curly to wavy to straight throughout the movie.

When the kids first see the motorcycle cop, the motorcycle has mirrors on it. When they talk to him, the mirror is missing, then it re-appears after they walk away.

Thackery grabs the Sanderson's metal cauldron as it sits over an open fire that holds a potion that was recently boiling without burning his hands.

Before they go trick or treating, Dani tells Max there is a full moon out, and it can be seen in the sky when Sarah sings her final summoning song. The movie is set in 1993, when Halloween was the day after a full moon. The closest year to then in which Halloween had a full moon was 1974. The last one was in 2020. The next closest one is in 2039.

Max is at school at the beginning of the film. It takes place on October 31, 1993, which was a Sunday.

New Zippo lighters don't come with lighter fluid. Max takes one off the rack in the Sanderson house, and lights it on the spot.

The kids did not stop trick or treating until 2 AM. The law would not allow kids to trick or treat that late. Trick or treating would end around 8 PM or 9 PM depending on what state.

After Winifred dies all of her spells were undone including the spell that transformed Thackeray. It can be assumed that when he transformed his body was killed and it was only his spirit or soul that took the form of a cat. When Winifred dies his soul was released and was allowed to pass on.

When Winifred is riding her broom, she pulls alongside Max in the driver's side as he races away from the Sanderson home after saving Dani, and asks for his driver's permit. She died 300 years earlier, so she shouldn't know about driver's permits or cars. She could have learned from the bus driver when she rode the bus earlier that night.

In the beginning of the movie, Sarah's singing lures Emily to the Sanderson house. Thackery and Elijah don't hear the song but instead see the beam of light coming from the Sanderson house. After Thackery climbs through the window Mary is able to smell him. It is possible that while Thackery is too old to hear the song, he is still young enough to be considered a child.

When the witches kidnap Dani and retrieve the book, the cupola on the Dennison's house explodes as they leave. Later, when the children walk past the house, the cupola appears to be undamaged. But if you look sharply on the back right side of it, it does show some damage.

Mary Sanderson refers to cooking with margarine. The sisters died in 1693. Margarine was invented in the 1800s, and was commercially available as a butter substitute in 1869. Mary watched 10-30 minutes of television commercials at "The Master's" house earlier in the evening, so she could have learned about it from TV.

When Winifred looks through her spell book, some of the pages have the same text.

When Max first gives Allison his number, it is on the top left corner of a piece of notebook paper, and the holes are clearly visible. Once they are outside and she returns the folded up piece of paper, his number is now on the opposite side.

When Mary Sanderson gets hit with the frying pan, it flexes as if it was made of rubber.

At the beginning of the film, Winnie hears Thackery peeking in the house. She looks out the window and says, "Oh look, another glorious morning..." Moments later, the town folk arrive to confront the sisters, and Mary exclaims they are "spending a quiet evening at home."

Allison's forehead is clear before she enters Max's house, after they've 'killed' the witches in the school kiln. When the Dennisons are calling for their parents, there is a smudge of dirt on her head.

In the original theatrical version of the movie, the car headlights that Alison shines into the Sanderson house are warm white. In the remastered version of the movie, the headlights are deep pink.

Obvious stunt double when Sarah Sanderson flies back to the Sanderson home after singing her song.

When the Sanderson museum closed due to "spooky events" they left a great deal of useful items behind such as brooms, vacuums, mops, and merchandise. They also left the door unlocked.

In 1693, when the Sanderson sisters are about to be hanged, Sarah laughs with her mouth wide open, and the cavity fillings in her teeth are visible.

When the witches are standing outside the house after Winifred pulls the kids mask off, you can hear Sarah say "weirdos" but her mouth doesn't move.

When the Sanderson sisters ask what year they are, Dani says 1993, but her lips say something completely different.

When Max, Dani, Allison, and Thackery the cat escape into the crypt under the cemetery to flee the witches, the kids are all coughing as soon as they enter. After Allison asks Dani, "Are you OK?" And Dani responds, "Mm-hmm," there is the distinct sound of a female coughing (sounds like Dani) but both of the ladies' mouths are closed.

In the party scene at town hall, moments before Dani says "they're here" you can see Allison mouth "they're here" but the group doesn't react. Then when Dani does say it, Allison looks around to find the witches.

After the children take Winifred's book and hide in the cemetery for the first time, the wires holding up Mary Sanderson are clearly visible as she flies down on her broom towards the children.

When the witches get off the bus, a Toronto Transit Commission sign is visible behind their heads. Bus service in Salem, Massachusetts, is provided by the Massachusetts Bay Transportation Authority, also known as the MBTA, or the T.

Sarah sings her song in the sky above the lighthouse along the coastline of Marblehead, one town over from Salem.

While the witches are in the library, the PA says book-related phrases in two languages; English and Canadian French. The movie is set in Salem, MA but certain scenes were shot in Canada, hence the Canadian French and the Toronto Transit sign mentioned above.

When the kids first enter the Sanderson "museum," Alison turns the lights on. If the place had been closed for several years, the electricity would likely have been shut off. The door was left unlocked, too, but if these realities were observed, there would not have been much of a movie to work with.

While the kids are in the cemetery for the first time, Winifred mocks Max by repeating "It's only hocus pocus". He said that before lighting the candle, so she couldn't have known it was spoken.

At the climax, the Sandersons are left with just enough potion for a single child they require to survive past the night. Winnie willfully ignores the numerous children that Sarah lured just to get revenge on Dani for calling her ugly. But there's no reason beyond wounded pride to go after Dani when the sisters could have used any of the hypnotized children and gotten their revenge later.

As the kids make their second escape from the Sanderson house, Max could have ended the threat of the the witches by simply blowing out the black flame candle, and for good measure, taking the Book with them.

In the classroom scene, Allison claims that Halloween was derived from the ancient feast called All Hallows Eve, when actually the original origin is from the ancient Gaelic end of harvest celebration of Samhain (Sah-win) in Ireland. All Hallows Eve was created by the Catholic church in response Christianize the original Pagan celebration.

At Allison's house, Dani is surprised to find out that there is a museum about the Sanderson Sisters. However, when Allison leaves to change, Dani says that her friends at school told her all about that place, meaning she had to know it was a museum at one point.

Thackery Binks switches between Old English and 1990s slang. During the first parts of the movie, he uses Old English. When he first talks to Max, he uses slang and sarcasm. At the end of the movie when his spirit appears to Dani, Max, and Allison, he speaks in Old English again. Since he has been keeping watch on the Sanderson House for three centuries, it should be no surprise his language has evolved along with that of the humans he has been observing.

During the adult's Halloween party, Dani tries to tell her mother about the Sandersons. Jenny, thinking she's on a sugar high, asks "How much candy have you had, honey?" Dani replies "I haven't OD'd! I haven't even had a piece!" She had a chocolate witch lollipop at Allison's Halloween party earlier, though she could've forgotten with all the excitement.

All the 17th-century characters incorrectly use the pronouns "thee" and "thou." Up until the Early Modern English period (often mistakenly called "Old English"), "thee" and "thou" were used as the second-person singular familiar pronouns. This meant they were used only with someone you knew well, someone much younger than you, and only when addressing a single person. So, it would make sense for the Sanderson sisters to use these pronouns with each other. However, Sarah's song is directed at multiple people, so she would have used "you" instead.

Additionally, "thee" and "thou" had largely fallen out of common use in most English dialects by about 75-80 years before 1692. Therefore, it would only be fitting for the Sanderson sisters to use these forms to emphasize that they are much older than they appear.