Continuity mistake: Beast disarms a member of the Friends of Humanity whilst perched on a street lamp. When the angle changes to a wide shot, Beast is much higher on the lamp post and would have been too far out of reach to disarm the man in the first place.
Other mistake: When Wolverine, Gambit and Beast are battling members of the Friends of Humanity, Wolverine slices through the gun of one of their members. From the angle Wolverine is standing respective to the F.O.H. Member, he could not have possibly sliced through the gun without also slicing off the man's left hand.