Continuity mistake: In the flashback of Shadow King terrorizing a young Storm, in one shot she is shown sitting on the palm of his left hand. When the shot changes, she is now on the palm of his right hand. (00:15:18)
Continuity mistake: When Shadow King is saying Rogue will not dare attack him while he is possessing Storm's body, Storm's left earring has been drawn behind her earlobe. (00:11:27)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Magneto and Professor X meet in Antarctica, the white stripes on Magneto's right glove are red in one shot. (00:20:10 - 00:20:45)
Continuity mistake: When Storm is reunited with Mjnari after purging Shadow King from her body, Mjnari has a tear coming out of the outside corner of his right eye. When the shot changes, the tear is gone. (00:16:03)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Beast and Rogue are standing outside the hospital, there is a beige car in front of them. When the shot changes, the car is gone. (00:05:12)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Rogue and Beast first enter Storm's hospital room, Rogue is standing at the head of Storm's bed. When Rogue berates Beast for not assisting her and Storm at the end of the previous episode, she is now standing at the foot of the bed. (00:05:45 - 00:06:06)
'Til Death Do Us Part: Part 2 - S2-E2
Revealing mistake: In the second shot of Rogue and Beast standing outside the hospital, you can see they are floating about a foot above the sidewalk. (00:05:16)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Morph collapses after finally remembering how he came into Mr. Sinister's service, his boots which are normally yellow are colored blue. (00:15:00)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Cyclops and Jean are first shown shackled to platforms inside Mr. Sinister's lair, there is about 6 feet between them. When the shot changes, they are only inches from each other, and Mr. Sinister has suddenly appeared on the platform. (00:11:42)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: After Morph steals the Blackbird, there is a shot of Wolverine standing by his lonesome at the end of the hangar and looking out. When the shot changes, Beast is suddenly shoulder to shoulder with him. (00:11:32)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Graydon Creed is giving his speech, the tail of the bird on the backdrop behind him is several feet above his head. When the shot changes, the tail is about level with his shoulders. (00:06:35)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Jubilee is first shown in Storm's hospital room, there is a dresser and some other equipment against the wall behind her. In the final shot of the scene, the dresser and other equipment have disappeared, and it is just a wall with a clock on it behind her. (00:12:40)
'Til Death Do Us Part: Part 2 - S2-E2
Continuity mistake: When Wolverine is saying it's time for the big game, the pink stripes on Gambit's right leg are on the inside of the leg, when they should be on the outside. (00:17:30)
'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 2 - S2-E2
Continuity mistake: When Morph is remembering who Mr. Sinister is, the flashback shows Morph lying on the ground with his right side facing Mr. Sinister. However, the previous episode showed that Morph's left side was facing Mr. Sinister. Morph is also suddenly wearing a jacket in this flashback. (00:14:34)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When the bartender is asking Beast if he knows the President, there is a single red striped 11 ball on the pool table in the background. When the shot changes, there are now what appears to be the solid green 6 ball, and the purple striped 12 ball. (00:11:04)
'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
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: 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 Morph is looking at the mansion through a pair of binoculars, the binoculars have two lenses. When the mansion is shown from the binoculars' point of view, there is only one lens. (00:13:43)
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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