The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is getting ready to attack Dark Xavier, the ticket booth behind him is unoccupied. When Dark Xavier deflects Gambit's kinetically charged playing card to the ticket booth counter, a man is now inside the booth. The bottom center window also goes from being closed to being open. (00:12:16)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Gambit is saying "Wolverine, what's happening," the sclera of his eyes are white, when they should be black. (00:12:16)
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
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 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 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 is looking at Moira and Banshee from his window, as the camera zooms in on the latter two, you can see they are facing each other, and Moira has her left arm on or near Banshee's hip. When the shot changes, they are standing side by side, with Moira's arms wrapped around Banshee's left arm. (00:17:41)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: When Lilandra first appears in Xavier's room, she appears to be around 7 feet tall. She is nowhere near that tall in subsequent shots. (00:18:29)
The Phoenix Saga (2): The Dark Shroud - S3-E4
Continuity mistake: The tops of Juggernaut's boots change from brown to orange after he bursts into Professor X's room. (00:20:30)
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 (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 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 Xavier is telling Lilandra that Juggernaut's body is invulnerable, the destroyed TV is just on his left. When the shot changes, he is now directly in front of the TV. (00:03:27)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Black Tom Cassidy attacks Xavier from behind, the window is adorned with pink drapes. Moments later after he knocks out Lilandra, the drapes have disappeared. (00:04:27)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Juggernaut throws Xavier out the open window, Xavier is shown going through roughly the middle area of the open space. When he is flying through the air from Banshee and Moira's perspective, he is falling from a higher position. (00:05:02)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: The yellow paint for the "H" marking on the helicopter pad on the roof of the Muir Island Research Center becomes smaller when the shot changes. (00:09:20)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Black Tom Cassidy is first shown counting his money, he's seated at a table with no wall near his backside. Moments later when Erik the Red is telling Lilandra what name he goes by on Earth, there is suddenly a window behind Cassidy, within an arm's reach. (00:10:22 - 00:11:09)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Wolverine is first shown detecting scents in Xavier's room, the glove on Gambit's right hand is the same color as his flesh. (00:11:25)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Erik the Red is asking Lilandra why she won't answer him, there is a lamp in the background on the left. When the shot changes, a decorative stand has appeared next to the lamp. (00:12:00)
The Phoenix Saga (3): Cry of the Banshee - S3-E5
Continuity mistake: When Xavier faints after trying to contact Lilandra, Gambit's cowl is the same color as his flesh. (00:12:11)
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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