Other mistake: When Gambit pushes out the vent shaft cover from inside the ventilation system, his hands emerge gripping the outside of the cover. This would be physically impossible. (00:09:55)
Continuity mistake: Gambit uses his staff to pole vault himself across the rooftops. When he lands, the staff has vanished. (00:09:30)
Continuity mistake: When Kirkland is going through photos of Rogue, he stops on a photo of the full X-Men team. When the shot changes, the photo he is stopped at is of Rogue and Cannonball. (00:08:25)
Character mistake: When Beast is showing Gambit and Rogue the news report about Cannonball, it is shown to be featured in a magazine called Philologist's Quarterly. When Beast leaves the room, he remarks "Ah, there's my 'Philologist's Quarterly'." as if he didn't already see it. (00:04:25)
Continuity mistake: When Rogue and Gambit are playing pool, Rogue's arms are bare from the elbow down except a yellow wristband on each wrist. When Beast comes in with the mail, Rogue is wearing her usual green sleeves and yellow gloves. (00:04:00 - 00:05:10)
Factual error: When Dr. Essex is walking through the museum with Charles Darwin, a fully-assembled dinosaur fossil is on display. This scene takes place in London in 1859, but the first ever dinosaur to be displayed didn't occur until 1868 in Philadelphia. (00:03:55)
Continuity mistake: Cocteau's tombstone has gained a gold plate on the front of it by the end of the episode. (00:01:35 - 00:19:25)
Other mistake: When Wolverine is carving "HERO" into Cocteau's tombstone, he is shown to be using all three claws on his right hand to do so, but the carving looks like it was only carved with one sharp point. If he was using all three claws, each point of articulation for each letter should have been tripled. (00:19:05)
Continuity mistake: After Wolverine carves "HERO" onto Cocteau's tombstone, he has to walk several feet away from the tombstone to get to Justine. When the shot changes, both of them are only a couple steps away from the tombstone. (00:19:15)
Other mistake: When Justine is telling Wolverine about her father's accomplishments in the war, the cel shading is very fuzzy throughout the entire shot. (00:18:30)
Continuity mistake: Wolverine's gloves have suddenly disappeared after the robot is destroyed,. (00:15:05)
Continuity mistake: The Red Skull punches Captain America's shield with his left hand, but then shows pain in his right hand. (00:13:10)
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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