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. (00:11:40)
Continuity mistake: The three tear marks in Wolverine's uniform from when Lady Deathstrike slashes him change position several times. When she first slashes him, the tear marks appear on his chest. Other shots show the tears to be closer to his abdomen. (00:13:50 - 00:16:00)
Continuity mistake: When Professor Oyama says "Adjust the feed accordingly," you can see in the reflection of Wolverine in his glasses that the device that has been on Wolverine's left leg throughout the scene is missing. (00:10:20)
Continuity mistake: When Professor Oyama is telling Dr. Cornelius to begin the adamantium feed, Wolverine is reflected incorrectly in Oyama's glasses (note the device on Wolverine's left leg). (00:09:50)
Audio problem: Gambit's bō staff starts making a twirling sound a split second before he starts twirling it. (00:18:40)
Revealing mistake: When Beast states that it appears safe to enter the alien ship, his right arm and right leg completely pass through Professor X's body and hover-chair respectively. (00:13:45)
Continuity mistake: The warning sign on the containment vessel inside the alien ship disappears in the wide shot. (00:14:40)
Continuity mistake: When Gambit and Jubilee are chasing after Wolverine, Gambit's gloves, pants and headgear alternate between being blue, black or a combination thereof depending on the shot. (00:07:55)
Continuity mistake: When Gambit scoffs at Jubilee's notion that the X-Men are a family, his irises which are normally red are now white. (00:07:25)
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. (00:06:55)
Continuity mistake: Gambit's black cowl is suddenly blue when Jean Grey is explaining that the alien spacecraft is a prison ship. (00:15:25)
Continuity mistake: The scratch marks Lady Deathstrike makes in the alien ship don't appear until she mentions them. (00:04:00 - 00:05:15)
Continuity mistake: When Wolverine says "Come on kid" to the unconscious Jubilee, the fingers of his left hand are flesh colored when they should be colored blue from wearing gloves. (00:04:50)
Continuity mistake: The glove on Magneto's right hand disappears after Mr. Sinister blasts him in the back. (00:17:20)
Mojovision - S2-E11
Continuity mistake: When Wolverine and Jean Grey are being shuffled in to their television program, Wolverine's face is yellow. (00:15:35)
Mojovision - S2-E11
Continuity mistake: When Cyclops and Storm are about to be shuffled in to their television program, Jubilee can be seen standing between Wolverine and Storm, despite the fact that she was not among the X-Men that were abducted by Spiral, nor is she seen again for the rest of the episode. (00:10:05)
Continuity mistake: When Rogue is crashing through several levels of the mansion, the last one she crashes through is Storm's greenhouse and you can see through the windows that it is light outside. When she crashes through the ceiling of the mansion a split second later, it is suddenly dark outside. (00:08:15)
Other mistake: After Rogue knocks Gambit over, Gambit is in the foreground and Rogue is in the background. Despite this, the heel of Rogue's right boot appears in front of Gambit's left foot. (00:06:32)
Other mistake: When the Blob picks up the bucket of ice cream, he says "Oh boy, tutti frutti!", but the label on the bucket says "Vanilla." (00:03:50)
Time Fugitives: Part 2 - S2-E8
Continuity mistake: Bishop is shown trying to disperse the crowd at the quarantine site. When Cable appears on the rooftop ready to snipe him, Bishop is shown walking among the crowd. When Cable relents, Bishop is back trying to disperse the crowd. (00:06:15)
Answer: Chris Potter, the original Gambit voice actor, did indeed quit the role in the 4th season. His last episode was The Phalanx Covenant Part 1 so it seems reasonable that Fox would limit the use of the character even though it was recast. It doesn't appear that Potter left the role due to animosity, he stated in an interview that he wished to play Gambit in the first live action X-Men film.
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