'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Rogue wakes up after Gambit kisses her, there is a pink pillow on the sofa. When the shot changes to her inadvertently kinetically charging the armrest with his powers, the pillow has disappeared. (00:16:23)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Wolverine leaps out to engage the Danger Room doppelganger of Cyclops, his claws are extended. When he lands, there is a closeup shot of his right hand, and his claws are suddenly retracted, and he extends them again. (00:02:16)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Wolverine stabs the Danger Room doppelganger of Cyclops, he is running him through in the center of the chest. When the shot changes, he is now stabbing him through the left collar bone area. (00:03:04)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Beast is saying "What's in a name," he and Cyclops are standing on the right side of the red carpet, and Gambit is standing right behind Beast. A couple of shots later, Beast and Cyclops are now standing on the left side of the red carpet, and Gambit is now standing several feet away by the door. (00:05:32)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When Morph, disguised as Wolverine, bumps into Rogue, she is holding a steaming mug of coffee. When she tells him she is going to the rec room to take a nap, she is holding the mug sideways, with no steam coming from it. The camera was on her face for most of this sequence, so she couldn't have finished drinking it, and there is no spilled coffee on the floor, so the mug should still be steaming. (00:14:09)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When the bartender begins saying "I bet you know the President," she is standing by Beast's left shoulder. When the shot changes, she is face to face with him. (00:11:13)
Continuity mistake: When the X-Men are flying to where Magneto is, the sclera of Gambit's eyes are colored white, when they should be black. (00:04:37)
Continuity mistake: When Wolverine is telling Jubilee that she isn't going on the mission, the parts of his mask next to his cheeks are yellow, when they should be black. (00:10:41)
'Til Death Do Us Part: Part 1 - S2-E1
Continuity mistake: When the Friends of Humanity are getting in the car to escape from the fight, the backseat area of the car is shown to have window louvers that are the same red color as the car's body. When the shot changes and shows the car from the interior, the windows are plain glass. (00:12:09)
Factual error: When Senator Kelly is giving his campaign speech, the U.S. flag behind him is missing one stripe and has at least two too many stars. (00:19:30)
Continuity mistake: When Jubilee is saying how much being a member of the X-Men means to her, one shot shows Gambit looking despondent, and the lines on his collar armor are missing. (00:10:53)
Continuity mistake: At the beginning of Senator Kelly's campaign speech, his campaign button is predominantly white with some blue at the top and bottom. When the shot changes, the majority of the button is now blue, with only a small portion in the center being white. (00:19:20)
Continuity mistake: When Gyrich's gun slides over next to Cyclops' feet after Wolverine tackles him, you can see Cyclops, Rogue, and Storm are standing at the entrance of the Lincoln Memorial. When the shot changes, the three are no longer near the entrance. (00:09:07)
Continuity mistake: When Trask's voice is first heard coming from Gyrich's cell phone, the phone is in the top left corner of the floor tile. When the shot changes, the phone is now in the center of four smaller tiles. (00:09:12)
Continuity mistake: When Beast is first shown in his prison cell, the X logo on his waistband is black with a red background. When Jubilee hugs him, it is now a red x on a yellow background. (00:19:51)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is jumping onto the tree branch, the first shot shows that he is jumping towards the right side of the tree. When the shot changes to him landing on the branch, it is suddenly on the left side of the tree. (00:12:00)
Continuity mistake: When Master Mold is telling Trask that mutants are humans, Trask's right hand is raised near his face. When the shot changes, his hand is suddenly lowered at about waist-level. (00:15:11)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit is telling Rogue that he'll park her car, the pink stripes that are normally on his pants are missing. (00:02:40)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Gambit announces his arrival, he is standing just in front of the doorway. When he puts his hands up after Bishop draws his gun on him, there is now a wall behind him. (00:03:07)
Days of Future Past: Part 2 - S1-E12
Continuity mistake: When Xavier is speculating if he is the one Gambit is supposed to assassinate, he is at Jubilee's 3 o'clock. When the shot changes, he is now at her 2 o'clock. (00:06:31)
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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