Goofs

When the sisters face the demons at the end of the episode Prue's bag seems to appear in her hands when her bag was clearly knocked to the floor and no effort was made to pick it up. Cut to Elliot and their is another bag on the floor, yet Prue only came into the room with one bag.

When Andy brings Prue the athame, and she grabs her computer pulls it to her to search for it more, the computer already shows the picture of the athame with words next to it before she even starts typing or searching for it.

When Allison meets Prue at the manor and explains her situation, she says, "... Everything was fine; right on schedule. Until about six 'days' ago." However, Christie's mouth formed the word "weeks." Her voice was dubbed starting with the word "days" and the dubbing ran for the next full sentence."

At around 38.42 Andy begins lip reading before Grace even began talking.

According to the show, Hecate only comes to Earth once every 200 years, yet she was able to strike a deal with Elliot's mother just a few decades prior.

In a well-organised, high-class marriage with hundreds of guests, the bride is secretly replaced, just before the marriage, with another woman who looks completely different, and nobody dares to ask why, not even the "legitimate" bride's relatives (who never appear). Meanwhile, a man is killed in mysterious circumstances, and there is clear incriminating evidence pointing to some people involved in the marriage, but the police doesn't arrest nor question anybody: on the contrary, at the end Andy is probably satisfied with the unidentified murderer and her accomplices mysteriously disappearing into thin air! A handful of people disappeared, but no questions are asked. Before that, by the way, a demon interrupts a public ceremony (with hundreds of guests) by casting a terrifying spell, and nobody goes to the police crying and shouting for help, nobody calls a journalist, nothing: they simply drop it, and go home. No search by warrant is carried out in the villa, which would find clear evidence of a fight in the cellar. No further investigation is carried out in the security camera footage, which would probably show unbelievable things that would change the perception of the world as we know it.

Prue sounds surprised when Jade opens the fertility icon, yet Rex had told her it was a gift for Spencer wedding.

Piper tells Phoebe 'you're supposed to take the garbage out, not dig through it,' but she threw the pregnancy test box on top of the garbage where it was visible to anyone who happened to glance over, just like Phoebe did. There was no digging involved.

Allison tells Prue that Jade showed up 6 days ago, but right before she showed up Allison and Elliot told his mom they were going to get the marriage license the next day before the rehearsal. The rehearsal is the night before the wedding not nearly a week before.