'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: During the fight in the streets against the Friends of Humanity, the pink stripes on Gambit's pants are missing until the last shot of the scene when he, Beast and Wolverine are fleeing, and even then, they disappear and reappear as he is running. (00:11:20 - 00:12:48)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Wolverine is slicing off the roof of the car, he is first shown to be running his claws down the center. A couple of shots later, he is cutting a square-shaped hole into the roof, with no tears going down the center. (00:12:17)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Storm is talking to and walking towards Jubilee in the War Room, the TV that everyone was watching is suddenly off, and seems to have disappeared altogether, as no screen is visible. When the shot changes, the TV is back on, and the screen appears to be shorter and wider than first shown. When Xavier is leaving the room, the TV is off again, and the screen like before seems to have vanished. (00:09:16 - 00:10:02)
'Til Death Do Us Part: Part 1 - S2-E1
Audio problem: When the Friends of Humanity are approaching the mutant that looks like a werewolf, they are saying "No more mutants," and none of them are pressing their lips together to produce the "M" sounds when saying "more" and "mutants." (00:08:37)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When the Friends of Humanity are attacking the mutant, the amount of spacing between the letters on the sign that says "Burgers" decreases when the shot changes. There is also a man painting a red "M" on the door below the sign with his left hand while holding a paint bucket in his right hand, and he only paints half the letter before the shot changes. When the shot does change, the "M" is fully formed, and the brush and bucket have swapped hands. (00:08:28)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Morph is first blasted by the Sentinels in the flashback, it leaves a small hole in the chest area of his uniform. When Mr. Sinister approaches him, the hole is now much larger, exposing his entire chest and abdomen. (00:07:47)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When President Kelly is issuing a pardon to Beast, the lapels of his suit jacket are white. A couple of shots later, they are the same peach color as the rest of the jacket. (00:05:54)
'Til Death Do Us Part: Part 1 - S2-E1
Other mistake: When Gambit is attempting to kiss Rogue at the wedding, the man standing over Gambit's right shoulder has no face. (00:04:03)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: The blast damage Jubilee causes to the door of the War Room suddenly disappears after Morph (in the guise of Rogue) exits. (00:15:00)
'Til Death Do Us Part: Part 1 - S2-E1
Deliberate mistake: When the Friends of Humanity are secretly filming their fight with Beast, Wolverine and Gambit, their cameraman is shown to be filming from the street behind a post box. However, the footage that they submitted to the news is merely the same camera angles shown from the viewer's perspective of the show. (00:11:45 - 00:13:20)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: In the first shot of Rogue, Storm, Wolverine and Gambit watching Professor X's holographic message, Gambit's trenchcoat is colored yellow and his hair is colored black. The animators must have confused him for Jubilee at first, because those are the colors of her jacket and hair. (00:12:50)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: Professor X's wedding tuxedo suddenly changes into his usual green suit when Beast is giving an update about President Kelly. (00:05:50)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: The ribbon on the wedding present that Beast is carrying disappears when Jean's bouquet lands on it. (00:05:30)
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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