Savage Land, Strange Heart (2) - S3-E9
Other mistake: When Rogue tells Beast that the word "Zaladane" kept popping in and out of her head when she and Sauron made physical contact, a border roughly in the shape of the letter "D" appears around her mouth. (00:08:08)
The Phoenix Saga (4): The Starjammers - S3-E6
Other mistake: When D'Ken is saying "Destroy them all," he is speaking with a German accent. (00:17:09)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Other mistake: When Xavier is telling Moira about how he and Lilandra were attacked, Moira dismisses his claim, reasoning that he came to her for help because he could no longer trust his own mind, and that no-one else had been in his room. She witnessed him flying out of a window, and he's a paraplegic. Unless she thinks he somehow catapulted himself out the window, she shouldn't have been so dismissive of his claim. Not to mention the damage to the room, including the bed being thrown against the TV. (00:05:21)
The Phoenix Saga (1): Sacrifice - S3-E3
Other mistake: When Dr. Corbeau opens the door to the locker room, Cyclops, Jean Grey and Wolverine are in his direct line of sight. Despite this, it isn't until he takes several steps into the room that he realises they aren't his shuttle crew. (00:08:35)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Other mistake: After the shuttle crashes into the Upper New York Bay, the X-Men escape the wreckage and swim up to the surface, with Wolverine being the first one to appear. Given that Wolverine's skeleton is coated with a heavy metal, not only should he not be the first one to surface, he should actually sink instead. (00:04:06)
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.
BaconIsMyBFF