Audio problem: When Barbarus says "Get them!" he says the word "them" without closing his mouth. It's not possible to say "them" without closing your mouth at the end of the word. (00:20:10)
Other mistake: When Wolverine, Rogue and Jean Grey are falling down the hole, they are all falling at the same rate, yet Wolverine lands a couple seconds after the other two. If anything, he should have landed first because he weighs more than them, especially since his bones are coated with metal, and Rogue and Jean Grey are shown to be slowing their falls by using their flight and telekinetic powers respectively. Wolverine also appears to land a couple feet in front of the hole.
Continuity mistake: The size of the hole beneath the trap door in the Thieves Guild's mansion changes. When Wolverine, Rogue and Jean Grey are shown falling down it, it is easily large enough for the three of them to fall down without bumping into each other. When we see the hole in the ceiling after Rogue destroys the wall that was falling on her, the hole is barely large enough for one person to fit through. The hole also moves closer to the back corner of the room, whereas it appeared to be closer to the back-center of the room once they landed.
Continuity mistake: The orientation of Gambit's mini-jet respective to the Blackbird changes. When the Blackbird first lands, the mini-jet is perpendicular to it. When Wolverine, Rogue and Jean Grey go over to inspect the mini-jet, it is suddenly parallel to the Blackbird.
Continuity mistake: Shortly after Wolverine, Rogue and Jean Grey enter the Thieves Guild's mansion, they fall down a trap door. However, the trap door is not there when they first enter the mansion, instead only appearing in the shot where they step on it.
Other mistake: When Bella Donna is saying that Gambit was wise to leave the Thieves Guild, there is a black horizontal line on Gambit's right cheek that disappears and reappears in sync with his blinking.
Continuity mistake: In Gambit's flashback it is shown that the chosen one from the Guild of Thieves is banished to a "darkness never-ending" for breaking the covenant of the tithe. However, the same character can be seen later in the episode fighting alongside his fellow guild members.
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Cable is telling his teammate that they aren't retreating, his hands are on her shoulders. When the shot changes, his hands are no longer on her shoulders. (00:02:45)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Cable is watching his teammate get sucked into the temporal cyclone, his eyebrow is the same silver color as his hair, when it should be black. (00:03:49)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is shown returning to his original timeline, he is wearing the temporal band on his right arm. However, when he was sent back to his timeline at the end of the episode Days of Future Past: Part 2, he was not wearing the band because Rogue tore it off his arm and crushed it, which is what caused him to be sent back in the first place. (00:05:08)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: Throughout the episode, Bishop's goatee alternates between fully covering his chin and having a small spot of exposed skin beneath the soul patch. Sometimes there is even the outline drawn of the exposed skin beneath the soul patch, but it is colored the same as the goatee. (00:05:10 - 00:20:05)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop returns to the year 2055, his shoulder pads are yellow. When he is approaching Forge, the shoulder pads are now the same blue color as the rest of his outfit. (00:05:12)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Bishop is shown returning to the year 2055, he looks out the window to a see a pristine looking city, and claims his intervention in the past to be a success. This is a contradiction to Bishop's return when it was originally shown at the end of the season 1 episode Days of Future Past: Part 2, in which he appeared in a run-down city and remarks that everything looks the same as it did when he left. (00:05:15)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Forge is first shown standing in front of the tube containing Wolverine's skeleton, the skeleton is incorrectly shown to be around 7 feet tall (Wolverine is only 5'3"). A couple of shots later, the skeleton is now shown to be more accurately sized. (00:05:19)
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
Revealing mistake: When the electronics store manager collapses onto the display stand, if you look closely, you can see the business cards he falls onto fly into the air before his head makes contact with the stand. (00:08:23)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the man accuses Jubilee of giving the electronics store manager the plague, the manager's shirt has changed from yellow to gray. (00:08:24)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the man in the electronics store is calling Jubilee a plague carrier, her purple jacket and black hair have been colored green and dark brown, respectively. (00:08:37)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is telling Jubilee she needs to eat more vegetables, the black and red middle section of his waistband turns blue. (00:09:08)
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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