Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee's foster father is showing his wife what Jubilee did to the VCR, the glass door for the entertainment shelf goes all the way to the top. When the wife is asking her husband if he is sorry they took in Jubilee, the glass door is now only tall enough to cover the bottom and middle shelves. (00:02:17)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Gambit is saying he could easily break into the Mutant Registration Center by himself, Morph is wearing yellow gloves. When Morph suggests going into the building disguised as Gambit, his hands are suddenly bare. (00:15:45)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is saying "That's a nice way of saying 'mutants'," the black horizontal line on her left earring briefly turns the same red color as the rest of the earring. (00:12:59)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Gambit and Wolverine are sparring in the Danger Room, at one point Gambit dives onto a piston and then rolls off moments before it smashes him into another piston, with a piece of the bottom right of his trenchcoat being torn off in the process. When Jubilee is explaining to everyone that she was trying to help Gambit, his trenchcoat is now untorn. (00:11:07 - 00:11:43)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Gambit lands in the car, his trenchcoat is entirely within the car. When the Sentinel is shown approaching the car, the bottom of the trenchcoat is now hanging over the passenger side door. (00:07:11)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: Just before Jubilee accidentally destroys the arcade game she is playing, you can see a basket of chili fries resting on the game's control panel, and the chili is a dark green color. When the shot changes, the chili is now reddish-brown. (00:03:23)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the dog is barking at the Sentinel, the sidewalk is crumpled from the Sentinel landing on it. When the Sentinel reaches out for the dog, the sidewalk is now undamaged. (00:02:06)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Wolverine, Storm and Morph are approaching the door after Beast has disabled the electronic beams, the door handle is pointed at 6 o'clock. When Storm grasps the handle, it is pointed at 5 o'clock. (00:20:38)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Beast is first approaching the security lockbox, the word "Security" takes up the entire width of the front panel. When the shot changes, there is now more spacing on either side of the word. (00:20:17)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the guard orders Wolverine, Beast and Morph to halt, Wolverine and Morph are standing next to each other, with Beast behind and between them. When the shot changes, Morph is now behind Wolverine to his left, and Beast is behind Morph and to his left. (00:19:19)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Beast tosses Wolverine over the fence, Wolverine's bare arms are the same yellow color as his costume. (00:19:12)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the civilian slams on his brakes to avoid hitting the Sentinel, you can see he is wearing sunglasses, but within the same shot, the dark lenses turn into clear lenses. (00:14:59)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the Sentinel is resting against the building while lying in wait for Jubilee, the building itself has a solid exterior with the occasional window. When the shot changes, it is now a glass building. Additionally, when the Sentinel was resting against the building, its entire body was obscured, but when the shot changes, part of the right side of its body was sticking out. (00:14:35)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee blasts Wolverine across the Danger Room, Gambit is shown lying flat on the ground. When the shot changes, he is now resting on his elbows. (00:11:30)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is trying to gain entry to the Danger Room, she is pressing random buttons that light up. When the shot changes, some of the lit up buttons are not ones she pressed, and some of the ones she pressed are no longer lit up. (00:10:34)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is trying to open the door to the infirmary, the door handle is pointed at roughly 3 o'clock. When she uses her powers to blast the handle off, it is now pointed at roughly 5 o'clock. (00:08:42)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Gambit is blasted through the sign advertising the car that can be won, there is a noticeable amount of spacing between the exclamation point and the end of the sign. When the Sentinel begins approaching Gambit, the exclamation point now goes nearly to the edge of the sign. (00:07:11)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is first shown in the arcade, the space between the rows of games is roughly six feet. When Jubilee runs out of the arcade, the corridor is suddenly much wider. (00:02:57 - 00:03:37)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the arcade manager is confronting Jubilee after she accidentally destroyed the game she was playing, he is several feet away from her, with other patrons between them. When the shot changes, he is suddenly in her face. (00:03:27)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is first seen eavesdropping on her foster parents, you can see the shelves of their entertainment unit are empty. Moments later when her foster mother is questioning if Jubilee is really a mutant, her husband shows her what Jubilee did to the VCR just by touching it, and you can see the bottom two shelves now have items on them. Additionally, the coffee table goes from having a blue top with a brown border within it, to being a solid brown top altogether. (00:01:39 - 00:02:17)
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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