The Phoenix Saga (4): The Starjammers - S3-E6
Plot hole: Rogue is able to punch Gladiator and knock him off his feet, yet in the previous episode when the Juggernaut punched Gladiator he didn't even budge. The Juggernaut is a lot stronger than Rogue, so either Juggernaut's punch should have affected Gladiator or Rogue's punch should not have. (00:17:55)
The Phoenix Saga (4): The Starjammers - S3-E6
Plot hole: Corsair takes out the X-Men by having Raza calibrating their stun weapon to humans. Since Corsair is also a human, the blast renders him unconscious along with the X-Men, and the Starjammers take him away. When Wolverine and Phoenix regain consciousness, they realize that Cyclops has been taken by the Starjammers as well. The problem is since Corsair was unconscious, he couldn't have possibly ordered the Starjammers to take Cyclops with them, and the Starjammers had no reason to take Cyclops of their own volition. Raza even acknowledges that Corsair is the one that takes Cyclops. (00:08:15 - 00:09:00)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When Gladiator is telling D'Ken who Corsair's prisoner is, the section of the wall directly behind the tip of the throne is green. When the shot changes, it is now the same bluish-gray color as the rest. (00:15:43)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When D'Ken is running from the Phoenix, the M'Krann crystal has been colored roughly the same shade of gray as the pedestal it was placed on. (00:16:46)
The Phoenix Saga (4): The Starjammers - S3-E6
Audio problem: When D'Ken is ordering Gladiator to identify himself, he is speaking in a voice that sounds more like Dr. Corbeau from a few episodes earlier than it does D'Ken. (00:09:20)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When Cyclops and Corsair are boarding D'Ken's ship via the moving sidewalk, the speed at which the moving sidewalk is propelling them forward varies depending on the shot. (00:15:03 - 00:15:29)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When D'Ken is berating Erik the Red for being defeated by the X-Men, he is sitting on a throne. He then stands up and calls Erik the Red a fool, and when the shot changes, the throne disappears. (00:09:47)
The Phoenix Saga (4): The Starjammers - S3-E6
Character mistake: When Raza is firing the recalibrated stun ray at the X-Men, the control panel misspells "target" as "tareet." (00:08:10)
The Phoenix Saga (4): The Starjammers - S3-E6
Other mistake: When Captain Britain is shown flying by the Elizabeth Tower, the two clocks visible are displaying different times. The clock on the left is showing roughly 12:10, while the clock on the right is showing 12:00. (00:04:50)
The Phoenix Saga (4): The Starjammers - S3-E6
Other mistake: When the X-Men and Corsair encounter D'Ken in the hallway, D'Ken, Gladiator and Lilandra remain in the background while the X-Men and Corsair are wiped from the screen. It's as if this was meant to be a zoom in on D'Ken, Gladiator and Lilandra, but their size relative to the camera remained the same and the X-Men and Corsair are simply removed from view. (00:19:35)
The Phoenix Saga (4): The Starjammers - S3-E6
Other mistake: When Gambit is tossing playing cards in Lilandra's helmet, he is shown tossing four cards. All four cards are the exact same card (the ace of spades). (00:13:30)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: When Corsair first enters Cyclops' holding cell, the door says "Security Cell 3." When Corsair leaves the room, the door simply says "Security Cell." (00:09:00 - 00:13:15)
The Phoenix Saga (4): The Starjammers - S3-E6
Audio problem: When Phoenix says "We must movie quickly to safeguard the crystal," she is speaking in Lilandra's voice. (00:06:10)
The Phoenix Saga (4): The Starjammers - S3-E6
Continuity mistake: In the group shot when Phoenix says "of lives beyond measure," Moira McTaggert's hair is blonde and Wolverine is missing his gloves. (00:04:25)
The Phoenix Saga (4): The Starjammers - S3-E6
Other mistake: When D'Ken is saying "Destroy them all," he is speaking with a German accent. (00:17:09)
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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