Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Jubilee is saying goodbye to her foster parents, the topper on the roof of the taxi has "Taxi" written in bold lettering. When Jubilee is getting in the taxi, the lettering is nowhere near as bold, and an extra light has appeared on each side of the taxi, under the headlights. (00:20:01)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Storm destroys the final Sentinel, Gambit and Jubilee walk right up to it, and there are no other Sentinels near it. When the shot changes, there is another Sentinel on the ground right behind Gambit and Jubilee. (00:19:56)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the Sentinel is firing at Storm inside the factory, two of its blasts are emanating from the wrong side of its hand. (00:19:00)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Cyclops blasts off the Sentinel's arm, part of its shoulder is still intact. When it begins flying back to base for repairs, the entire arm is now missing. (00:16:18)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the President is using the elliptical machine, she has an aide standing to her left. A couple of shots later, the aide is now standing behind the President. (00:14:56)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the President is first shown on TV, the Great Seal behind her looks more like a shield before being shown to be an eagle a few shots later. (00:13:11)
Night of the Sentinels: Part 2 - S1-E2
Factual error: When the President is giving an address, the Great Seal behind her incorrectly depicts the eagle with its head turned towards its left wing. It should be turned towards its right wing. (00:13:19)
Night of the Sentinels: Part 2 - S1-E2
Other mistake: When the Sentinel throws Wolverine over the trees, you can hear him crash to the ground as soon as his body disappears from view. The ground in the area is flat with no tall hills, so Wolverine would require another second or two after clearing the treeline to crash to the ground. (00:10:24)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Cyclops is standing in the doorway to the garage, the communication device on his bandolier is entirely red, when there should be a black X on it as well. (00:09:42)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Professor X is asking Jean what's wrong, the upper corners of his eyebrows are not filled in properly. They are the same color as his skin. (00:07:41)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Storm is saying they need to destroy all the hard files, the file cabinet has no lock on it. When the shot changes, a lock has appeared. Additionally, the upper part of Storm's sleeve is the same color as her skin. (00:04:02)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Morph fools the guards into going into a different room, you can see him transform back into his regular self in silhouette, and his jacket suddenly goes down below his knees, similar to Gambit's, whereas Morph's jacket stops at his waist. (00:03:44)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When the guards are waiting to ambush the heroes, all of them have red hair. When Storm blows them all away with a gust of wind, one of them now has black hair. (00:02:45)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Wolverine shuts the door Strom is opening, the handle is pointed at 6 o'clock. When he starts sniffing the guards' gun oil, the handle is now pointed at 7 o'clock. Wolverine's hand also goes from being under the handle, to the center of the door. (00:02:50)
Night of the Sentinels: Part 2 - S1-E2
Continuity mistake: When Beast is leaping through the corridor, the black X with the black rectangular border on a red background on his waistband briefly becomes a red rectangle on a yellow background with no X. (00:02:37)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Wolverine, Storm and Morph are approaching the door after Beast has disabled the electronic beams, the door handle is pointed at 6 o'clock. When Storm grasps the handle, it is pointed at 5 o'clock. (00:20:38)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Beast is first approaching the security lockbox, the word "Security" takes up the entire width of the front panel. When the shot changes, there is now more spacing on either side of the word. (00:20:17)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the guard orders Wolverine, Beast and Morph to halt, Wolverine and Morph are standing next to each other, with Beast behind and between them. When the shot changes, Morph is now behind Wolverine to his left, and Beast is behind Morph and to his left. (00:19:19)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When Beast tosses Wolverine over the fence, Wolverine's bare arms are the same yellow color as his costume. (00:19:12)
Night of the Sentinels: Part 1 - S1-E1
Continuity mistake: When the civilian slams on his brakes to avoid hitting the Sentinel, you can see he is wearing sunglasses, but within the same shot, the dark lenses turn into clear lenses. (00:14:59)
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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