Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is saying he was trying to save lives, the strap running through Gambit's jacket sleeve is colored blue, when it should be the same brown color as the rest of the jacket. His left hand is also bare, despite the fact that he had been showing his gloves throughout the scene. (00:12:37)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Graydon Creed is testifying, the committee is seated at a table just a few feet behind him. When Beast takes the podium, Creed backs up several paces in line with the podium to almost nearly the wall. He couldn't get that close to the wall without stepping over the table. (00:14:34 - 00:15:30)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the X-Men begin running towards the Friends of Humanity's headquarters, keep an eye on Gambit in the background on the left, and you will see his black gloves materialize onto his bare hands. (00:17:43)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Apocalypse reveals himself, Bishop is standing next to Cyclops. When the shot changes, Bishop is standing by his lonesome. (00:18:37)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Apocalypse is preparing to shoot an energy blast at Bishop and Wolverine, his left arm is angled downward with his palm facing the floor. When the shot changes, his arm is at a level angle, and his palm is facing the other side of the room. (00:19:23)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: In the second shot of Storm and Jubilee standing in front of the bookstore, there is either a light or a security camera on the ceiling two tiles in front of the gray sign that wasn't there in the first shot. (00:07:25)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Jubilee approaches the manager of the electronics store, his name tag is the same yellow color as his shirt. A couple of shots later, it is now the same blue-gray color as his tie. (00:07:50)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is giving Jubilee a checkup, his labcoat alternates between having no breast pocket and having one with a tongue depressor in it. (00:09:22)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is saying "You all must have died in the plague," the temporal band he wears on his right arm is missing. (00:12:48)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is saying the plague could become dangerous for everyone, the breast pocket of his labcoat has disappeared. (00:13:17)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Rogue is saying "That oughtta put that peckerwood in his place," the X emblem on her chest is red, when it should be black. (00:15:02)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is saying "A viral weapon could be easily concealed," his right hand is raised, and you can see that his thumbnail isn't long. When he begins pressing buttons on the control panel a couple of shots later, his right thumbnail is now long. (00:16:34)
Time Fugitives: Part 1 - S2-E7
Other mistake: When the Friends of Humanity member is going through pictures of the X-Men on his watch, Wolverine is shown to have blond hair.
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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