Galahad
Regular
Well I don't consider it a sequel, because it "re told" parts of the Batman story that the first group of movies covered...it just did it in more depth and did it better --- how a young Bruce Wayne became Batman. In the original Batman movie this was shown in small detail. Batman Begins spent more time focusing on it, and basically tried to "restart" the franchise in the movies, if you will.
IMHO it can't in any way be called a prequel, because they have broken of significantly from the film continuity... Gordon's rank when he comes to know of Batman, the Joker not being the killer of Brruce's parents... being two that spring to mind.
I heard Superman returns did something similar in that it told about Clark Kent's younger years...but I havent seen it so I dont know. I just heard it was full of suck.
There is only really one flashback sequence and it isn't a majorly long scene. It has Clark running through the cornfields and bounding high into the sky. He tries to jump from a water tower over to the barn and falls through the roof. As he is about to hit the floor, he ends up hovering above the ground... and is aware he can fly.
And thats it.
It doesn't really rewrite anything already established. Sure, Superman first takes flight upon leaving the Fortress of Solitude after spending a long time talking to Jor El's hologram.
It doesn't do anymore than imply that it is the first time he flies. So IMHO there isn't really any contradiction.
I liked the film BTW.