Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Wolverine slashes through the fence, Gambit and Bishop can be seen already running towards the fence while Cyclops, Jean Grey and Beast stand behind. When the shot changes, Gambit is the last person to run through the hole in the fence with Cyclops, Jean Grey and Beast ahead of him. (00:17:40)
Time Fugitives: Part 1 - S2-E7
Revealing mistake: When Wolverine is free falling from the Blackbird, his left leg passes through Cyclops' right arm. (00:11:40)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: After Storm informs Cyclops that a mob is attacking Bishop, a shot of the rest of the team in the Blackbird shows that Gambit's neck is flesh colored when it is supposed to be black from wearing his headgear (this is corrected when the scene is reprised in the next episode). (00:11:25)
Other mistake: When Rogue drops the mug of coffee onto the floor, you can see that the coffee touches her boot, yet her boot does not get any stains on it. (00:04:05)
Continuity mistake: Gambit's sleeves turn from black to pink when Bella Donna reveals to him that she double crossed the Thieves Guild. (00:13:25)
'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 2 - S2-E2
Continuity mistake: When Morph parks the police car outside the gates of the X-Mansion, the front half of the car is in the immediate pathway of the gate. A couple of shots later, the entire car is parked along the curb. (00:02:50)
'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)
Continuity mistake: When Cyclops is running through the mine to search for Wolverine and Gambit, he uses his visor to track their location. When the shot changes to a first person view through Cyclops' visor, the background is merely moving up and down. If he was running as the previous shot had shown, the objects in the background from his point of view would become larger as he got closer to them. (00:16:50)
'Til Death Do Us Part: Part 2 - S2-E2
Other mistake: The show establishes that Jubilee is Chinese-American, but after she accidentally blasts Wolverine, the way she pronounces "Sorry" is the way the word is typically pronounced by Canadians (most of the show's voice cast, including the actress who voiced Jubilee, are Canadian). (00:11:00)
'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)
Continuity mistake: Jubilee destroys a Sentinel by tricking it into colliding with a train car full of tar and then using her powers to blast the car and cause tar to spill all over the Sentinel. After Jubilee is rescued by Rogue from the Sentinel that grabbed her from behind, the Sentinel that Jubilee destroyed, as well as the train car, have disappeared. (00:13:20)
Other mistake: When Magneto is watching the X-Men depart to rescue Senator Kelly, his cape can be seen swaying in the wind, but not his hair. (00:11:20)
'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)
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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