Continuity: There are two scenes during which Harry is shown having visions of the Dept of Mysteries while he is asleep. The first scene occurs after Harry's confrontation with Seamus in the Gryffindor common room. There are shots of Harry lying in bed wearing a short sleeve, crew neck tee shirt, but when he is startled awake by the vision of Voldemort, he sits up wearing a buttoned henley tee. The next day is the first day of Defence Against the Dark Arts class with Umbridge. That last shot of Harry in the henley tee shirt was cut from a later scene. Later in the film, when Harry has the vision of Arthur Weasley's attack, he is wearing the henley tee shirt.
In the Room of Requirement, when Neville and Harry are alone, Neville stands before the mirror and Cedric's photo and other things are taped to the mirror. Not only does the position of the photo, etc, change between shots, the tape also differs. This occurs in other scenes as well. See more...
Helen McCrory was originally cast as Bellatrix Lestrange, but dropped out due to her pregnancy. She was replaced by Helena Bonham Carter. In 2007, McCrory was cast as Bellatrix's sister, Narcissa Malfoy, in Harry Potter and the Half-Blood Prince. See more...
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Continuity: At 12 Grimmauld Place, when Harry and Sirius are in the room with the Black family tree, as Sirius says, "My parents with their pure-blood mania," the area of the wall with both Sirius's and Andromeda's names and burned off pictures is quite visible (as in other shots as well). Bellatrix's name is beside Andromeda's (her sister), but there is no picture over Bellatrix's name banner in this shot (only branches and leaves), nor in any other shot, except in the previous close-up, as Sirius says, "My deranged cousin," where there is a picture of Bellatrix over her name.
The barman seen with the goat at the shabby Hog's Head Inn where Harry and Hermione hold the first Dumbledore's Army meeting is Aberforth Dumbledore, Albus' brother. In the novels he runs the Hog's Head Inn and was investigated for performing improper magic on goats. (This was confirmed by J.K. Rowling in an online chat at The Leaky Cauldron.)
Dolores Umbridge: There is no need to talk for this.
Hermione Granger: No need to think is more like it.