Corrected entry: When Harry is attacking Malfoy, Crabbe and Goyle near the Shrieking Shack while under the invisibility cloak, Harry moves very rapidly, as he attacks two people at the same time. They couldn't possibly have been hit by Harry as he was swinging one of them around by the scarf. Also he is far away from this action and no contact is seen to have happened.
Corrected entry: When Lupin's class are facing the Boggart in the wardrobe, the wardrobe shakes violently. However, in the scene with Harry's Patronus lesson, we see a Boggart in a suitcase, and the suitcase is perfectly still.
Correction: The reason the wardrobe shakes is because the Boggart senses all the different people in the room and is "riled-up" by all the energy and of the different thoughts of what scares them the most, but when it is in the suitcase there is just Harry and Lupin so it isn't so bombarded with different energy and fears.
Corrected entry: In the last shot of the choir, near the end of the trailer, a girl in the second row, to the right of the screen, can be seen looking directly at the camera.
Correction: In the first shot of the choir, it can be seen that they're being conducted, apparently by Professor Flitwick, from a position immediately in front of them - i.e. roughly where the camera is in the final shot. It doesn't seem totally unreasonable that some of the singers might actually be looking at the conductor.
Corrected entry: When boarding the knightbus, the back of Harry's jacket is wet from when he fell on the ground. but moments later when it shows him walking through the bus, his top is bone dry. (00:08:40)
Correction: This was already noted earlier.
Corrected entry: When Peter Pettigrew is seen on the Marauder's Map, his dot's footprints are displayed as that of a human's even though he is in his rat form. However, during the credits Sirius' dot is shown changing from human footprints to dog pawprints and back again. Either Peter's prints should've shown up as rat prints or Sirius' should have consistently been shown as human prints.
Corrected entry: David Thewlis was originally considered to play Professor Quirrell in "Harry Potter and the Philosopher's Stone." Ironically, Thewlis is friends with Ian Hart, who did play the role.
Correction: This is not trivia for this film.
Corrected entry: When Harry and Hermione travel back in time to save Sirius, there is a continual ticking sound heard right through until they catch up with themselves in the hospital.
Correction: Yes, but since everyone can hear it clearly for themselves while watching the movie, it's not really trivia.
Corrected entry: Professor Lupin tells Harry that he recognised him the first time he saw him because he had his mother's eyes (and didn't have to be told who he was). The first time Lupin saw Harry, Harry had passed out and his eyes were shut - and Hermione was using Harry's name before he came round.
Correction: Hermione was only saying 'Harry', Harry Potter is not the only person in the world called Harry. Lupin didn't realise that this Harry was 'Harry Potter' until he'd come round and opened his eyes.
Correction: Lupin didn't know this was Harry Potter who was passed out. And everyone was talking about Sirius Black had escaped from Azkaban, not just Harry and his friends. The "first time" he saw him, Lupin was chasing off the dementor and when he turns around, he first saw Harry.
Correction: I think Remus was lying about recognizing Harry from his eyes. When Lupin was asleep in the compartment the trio sat in, Harry told them that Sirius Black is after him. And heard him because he was pretending to be sleeping but he heard everything. So no he knew he was Harry when he heard his story.
Corrected entry: Just before Hermione gets struck in the chest by the branch of the Whomping Willow, if you play the scene in slow motion you will notice Hermione has padding underneath her pink jacket. (01:25:25)
Corrected entry: When the Hogwarts Express stops and Ron turns to look out the window, Hermione says "Ouch Ron, that was my foot". However, in the next shot, Ron's feet are nowhere near Hermione's. He would have had to have been leaning in order to reach her foot, and he's sitting up pretty straight, too fast for it to change in one shot.
Correction: Harry was only attacking one person. He was swinging one of them round by the scarf while the other one tripped over the boy lying on the floor. Harry never touched him, let alone push him over.