Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Beast is saying that the virus was genetically engineered, the chin area of Bishop's black goatee is the same color as his skin. (00:13:01)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When Graydon Creed is first shown giving his testimony, in an overhead shot, we see the front row of the benches in front of him are filled with civilians. When the shot changes, the X-Men are now occupying the row on Creed's right. (00:14:34)
Time Fugitives: Part 1 - S2-E7
Continuity mistake: When the camera is panning across the X-Men as they are listening to Graydon Creed's testimony, Wolverine's arms are folded, and you can see the top portion of the blue glove on his left hand is the same yellow color as his outfit. (00:14:27)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira and Banshee are alerted to Xavier in distress, the building with his room is several yards away from the edge of the cliff. However, when Banshee dives to save Xavier from falling to his death, the edge of the cliff is now only a few feet from the building. (00:02:46 - 00:05:02)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira and Banshee's kiss is interrupted by Xavier's scream, his room is directly behind them. Moments later when Moira and Banshee are running to his room, it has moved significantly to the left of where they were just kissing. (00:02:44)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Moira is telling Banshee that Xavier has given everything for his students, she has her left hand placed on Banshee's right arm, and her right arm is down at her side. Then when she remarks that she thinks she's the only friend Xavier has, she is running her fingers through her hair. When this scene was shown in the previous episode however, she is grasping Banshee's arm with both of her hands, and she never runs her fingers through her hair. (00:02:26)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier is looking out at Banshee and Moira from the window to his room, he is facing the window directly. When the shot changes, his left profile is now facing the window. (00:17:31)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier lands his plane on the Muir Island helipad, the nose of the plane is directly to the right of Banshee. When the shot changes, Banshee is now standing a few feet in front of the nose. (00:17:01)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Dark Xavier knocks Cyclops into the wall, it leaves a small hole. When Cyclops gets up, the hole is now larger. (00:14:47)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is knocked into the hot dog stand, he is lying on his stomach with his left arm tucked and his right arm bent at the elbow. When the shot changes, both of his arms are now outstretched. (00:13:37)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Revealing mistake: When Jean is saying that she feels strange, the edge of an animation cel is visible moving left and right under her pillow. (00:05:27)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Beast is saying "Doctor, the solar probe, its shielding should be able to protect us," his neck alternates being different shades of blue. (00:19:05)
The Phoenix Saga (1): Sacrifice - S3-E3
Revealing mistake: When Cyclops is saying "Can this thing still fly," the purple coloring of the buttons behind him on the left shift up, while their black outline remains in place. (00:17:59)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is watching the shuttle launch, he has some sort of wheel on the right side of his hoverchair. Moments later when he regroups with Storm and Jubilee, the wheel is now missing. (00:09:17 - 00:10:07)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Cyclops is saying "They'll be safe in the isolation chamber " he and Jean Grey are standing near the lockers on the left side of the screen, four floor tiles away from the door. When the shot changes, the two of them have suddenly moved to the right, in line with the door, and only two floor tiles away from it. The floor tiles themselves are also now drastically smaller. (00:08:32)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Wolverine is breaking open the door to the space center, he leaves a long tear around the handle. When the shot changes, the tear has disappeared, and then returns in the next shot. (00:07:05)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When Xavier is talking with Cyclops in his bedroom and turns toward the window, the back of his hover chair is pointed towards the open area immediately on Cyclops' right. When the shot changes, the back of the hoverchair is directly facing Cyclops. (00:05:09)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Xavier and Cyclops begin arguing in the hallway, the door and doorway to Jean's hospital room are visible over and behind Xavier's right shoulder, and a chart is a few feet to the right of the door. A few shots later when Cyclops is telling Xavier that he failed to warn everyone, the chart is still visible, but now the door is missing, with the wall now appearing to be longer. (00:06:40)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Cyclops and Wolverine bring Jean back above the water surface, her wet hair is pointing straight down. When the shot changes, her hair is suddenly wavy and parted over her forehead. (00:05:00)
The Phoenix Saga (1): Sacrifice - S3-E3
Continuity mistake: When the X-Men barge into the locker room, as Gambit is running towards the camera, you can see his gloves are entirely fingerless, whereas when the team first entered space center grounds, only his thumb, index finger and pinky were fingerless. (00:08:01)
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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