Continuity mistake: As Edward Norton rises and walks away, the child that is in Naomi Watts' arms is lying on his side. The angle then changes and instantly the child is lying face up. The moment is continuous as Norton is still there, moving away. (01:47:20)
Continuity mistake: In the first movie, the prince has a little sister. She's mysteriously missing from the second movie, as if she never existed in the first place. I know she wasn't important to the plot, but still.
Continuity mistake: Flamenco lesson after Julie's fierce belch. Pablo says "Stretch with your fingers, make it beautiful"; The girl in brown behind the protagonist is in a part of her rotation blatantly out of continuity. (00:29:20)
Continuity mistake: [Blu-ray] When Red is rolling about on the floor after he has been shot, Chloe is asking him to get up and he has no blood on his mouth. In the next shot he suddenly has a lot of blood around and coming out of his mouth. (01:12:00)
Continuity mistake: When Marcus is being chastised for the clothing he is wearing in the dance room, you can see a reflected shot of him looking down toward his feet. In the next shot, he looks down again.