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
Deliberate mistake: When the Sentinel is first walking through the mall, its footsteps are so heavy that it shakes the building. When it is shown walking past the shop Gambit is in, there is no shaking of the building, presumably done so Gambit wouldn't notice it. (00:04:08)
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)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee's bedroom is first shown, the door is on the left side of the wall, she has a poster next to the door of what appears to be a chicken in a boxing outfit with gloves, a bookshelf next to that poster, a nightstand next to her bed and a poster of a girl playing drums on the wall behind the nightstand. After the Sentinel crashes through the window and pulls her bed out of the house, the nightstand and drummer poster have disappeared. When her foster mother comes into the room to see if everything is OK, the door is suddenly in the center of the wall, and the room itself, save for one poster on the wall that the head of the bed was on, is now completely empty. (00:01:54 - 00:02:51)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Jubilee is eavesdropping on her foster parents, her right hand is resting on and pointing in the same direction as the railing. When the shot changes, her hand is now nearly perpendicular to the railing. (00:01:39)
Continuity mistake: When the conference chairman is first shown at the podium, there are five microphones attached to it. A few shots later, there are only four. (00:07:55)
Continuity mistake: The trap door that Apocalypse uses to escape suddenly disappears once Wolverine tries to claw his way through it. (00:19:35)
Other mistake: After Gambit explodes the statue that was about to fall on Wolverine, there is no debris shown to be flying around them even though the statue was collapsing towards them. (00:16:30)
Continuity mistake: When the statue is about to fall on Wolverine, his arms are colored yellow. (00:16:25)
Continuity mistake: When the tank is falling through the hole in the bridge, the tank's gun barrels are pointed towards the water. When the shot changes to the tank landing in the water, the gun barrels are pointed towards the sky. (00:09:40)
Other mistake: When the tank falls through the hole in the bridge, the tank's occupants are impossibly shown to be clinging to the edge of the hole at the same time the tank is going over the edge, as if the tank and the occupants were occupying the same space. (00:09:40)
Continuity mistake: When the news reporter is first shown talking about the World Peace Conference, he has one blue eye and one brown eye. For all remaining shots he is in, both of his eyes are blue. (00:07:40 - 00:08:35)
Continuity mistake: When Storm is teasing Gambit for damaging the pool table, she is holding a television remote in her left hand, which is yellow (Storm doesn't wear gloves). A couple of shots later, she is holding the remote in her right hand (she had time to transfer the remote to her other hand, so no mistake there), which is colored correctly. (00:07:35)
Continuity mistake: When Rogue turns her head to face Jean Grey, some of her brown locks of hair turn white. When she turns back to face Gambit, the white locks become brown again. (00:07:20)
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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