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: [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.
Continuity mistake: Sylvia is in the kitchen as her dad fails to make Saturday morning breakfast. She is leant forward over a magazine. Look when the camera is in front of her and the page of the magazine has a big splash of red; she flips page in the reverse shot, but in the following she is still staring at the red page. (00:15:00)