(at around 1h 30 mins) When Batman is returning to the Phantom Zone, he is floating up at an angle away from the other characters, but when he hits the barrier, he falls straight down to be caught by Batgirl instead of landing much farther away.
One of the clips during the end credits song is mirrored, as Two-Face's burnt half is on his right as opposed to his left throughout the rest of the film.
Voldemort uses the spell Wingardium Leviosa to lift people in the air. However, the particular spell is only used to lift objects in the air, not people. The correct spell to lift a human in the air is Levicorpus.