Through out the Marvel Comic Studios career, they haven't been the best to make everything accurate based off of the comics (such as making Juggernaut a mutant in the 3rd X-men movie, and not having web shooters for Peter Parker in the god awful Spiderman Trilogy). The most recent Marvel Comic Film, X-men First Classes, was based off of a particular "saga" in the X-men universe. Some things that I noticed weren't particularly accurate were:
Alexander Summers' (Havok) could make energy "saws" and throw them, while in the comic books he could always use energy blast and beams through his hands.
Charles Xavier (Professor X) wasn't paralyzed like he was in the comics. In the comics, an alien threw a boulder on top of him, while in the movie a bullet to his spinal cord made him paralyzed.
Max Eisenhardt (Magneto) was referred to as Erik Lehnsherr the entire movie
Henry "Hank" McCoy (Beast) did not have super strength and speed before his transformation
Janos Q. (Riptide) mutant power in the movie was to create twisters and tornados with his hands whilst in the comic book he could spin at an incredible rate.
Please feel free to add additional errors in the movie!
Alexander Summers' (Havok) could make energy "saws" and throw them, while in the comic books he could always use energy blast and beams through his hands.
Charles Xavier (Professor X) wasn't paralyzed like he was in the comics. In the comics, an alien threw a boulder on top of him, while in the movie a bullet to his spinal cord made him paralyzed.
Max Eisenhardt (Magneto) was referred to as Erik Lehnsherr the entire movie
Henry "Hank" McCoy (Beast) did not have super strength and speed before his transformation
Janos Q. (Riptide) mutant power in the movie was to create twisters and tornados with his hands whilst in the comic book he could spin at an incredible rate.
Please feel free to add additional errors in the movie!