When Abigail shows off her new baby to the Brawnes, Brown goes to talk to Fanny in the next room. Abigail comes in holding her baby, its head rested in one crook of her arm. In the next shot when she turns and leaves, the baby has flipped so its head is on the opposite side of her.
When Keats looks out his window at Fanny, she walks to the window, pulls out a letter from her dress and holds it to the window. In the next shot, she pulls the letter from her dress again.
When Severn drinks from his teacup, he spills tea into his saucer. In the next shot, the same sequence is unintentionally repeated from a different angle.
(at around 1h 16 mins) After Fanny Brawne says "You would have it that I kill Mr. Keats with affection?" Mr. Brown says "Perhaps you will," but the audio doesn't match up with his mouth movements.
The subtitles precede the dialogue throughout the entire film.
The large blue butterflies featured in the 'butterfly' sequence are tropical and would not have been found in Britain at that (or any other recent) time.
A boom mic is visible above Keats' head in the scene where he bids a final and constrained farewell to Fanny inside the foyer of the house on the morning he departs for Rome.
Despite being born and raised in Lambeth, American actor Paul Schneider plays Charles Brown with a Scottish accent.