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.
Other mistake: When Wolverine is threatening Pierre, there is a continuous shot lasting roughly 8 seconds in which Bobby is telling Rogue about Bella Donna, all the while Wolverine and Pierre remain in the foreground, and neither of them so much as moves a muscle in that 8-second span. Rogue also remains motionless for a majority of the shot.
Other mistake: When Wolverine, Rogue and Jean Grey are falling down the hole, they are all falling at the same rate, yet Wolverine lands a couple seconds after the other two. If anything, he should have landed first because he weighs more than them, especially since his bones are coated with metal, and Rogue and Jean Grey are shown to be slowing their falls by using their flight and telekinetic powers respectively. Wolverine also appears to land a couple feet in front of the hole.
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Other mistake: The show establishes that Jubilee is Chinese-American, but after she accidentally blasts Wolverine, the way she pronounces "Sorry" is the way the word is typically pronounced by Canadians (most of the show's voice cast, including the actress who voiced Jubilee, are Canadian).