Continuity mistake: Wolverine first enters the sewers by ripping away a fence in the subway. When Jubilee and Gambit follow him, the fence is still intact. When they get closer it is torn again. Odd, really, because on the whole this show has few continuity errors, like self-mending clothes in other cartoons.
Continuity mistake: When Wolverine is trying to get to Professor Oyama, he slashes twice at the door leaving six claw marks. When the door is shown again after Wolverine is reacting to the explosion, there are suddenly several more claw marks without him ever slashing at the door again.
Continuity mistake: When Gambit is warning Wolverine that Leech's message could be a trap, the backboard of the basketball hoop is visible over his left shoulder. When the shot changes to Jubilee offering to help Wolverine, the backboard is visibly larger.