The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Phoenix is telling everyone that the crystal has been sealed, Wolverine's lower half has been miscolored. His trunks and boots should be blue, but have been colored yellow, and his legs should be colored yellow, but are flesh-colored. He's also wearing his mask in this shot, but in the next shot he is not wearing it. (00:17:42)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Phoenix is telling everyone that the crystal is sealed, Rogue is standing behind Wolverine and Cyclops. A couple of shots later, she is several feet in front of them. (00:17:42)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: When Lilandra is boarding her ship in the end, Cyclops and Corsair are in the background, and they are standing straight up. When the shot changes, Cyclops is now hunched. (00:19:08)
The Phoenix Saga (5): Child of Light - S3-E7
Continuity mistake: Throughout the first four episodes of "The Phoenix Saga" Lilandra has a slightly robotic effect to her voice. In this episode the effect is absent.
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: At the very beginning of the episode, Sauron can be seen wearing the necklace of Garokk. Not only is he not wearing the necklace a few shots later, but he isn't even supposed to have the necklace until a few minutes later in the episode when Zaladane gives it to him after he reverts to his human form. (00:01:05 - 00:04:10)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Kazar and his men reach the shore outside the citadel, one of the men suddenly has green skin, despite being shown with Caucasian skin tone moments before. (00:01:54 - 00:02:15)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: When Sauron is saying "Cowards, fools, come back," his mouth isn't moving. (00:02:02)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: When Sauron says "Ka-Zar, I warned you!", Ka-Zar is actually the one mouthing the line. Note: this mistake may only apply to the DVD version of the episode. Sauron is the one mouthing the line in the Disney+ version of the episode. (00:02:40)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Zaladane is first shown, she is standing several feet in front of the doorway. When the shot changes, she is now inside the doorway. (00:02:45)
Savage Land, Strange Heart (1) - S3-E8
Revealing mistake: When Zaladane is helping Sauron escape, she uses her staff to reveal a hidden stairway in the floor. As Sauron descends the steps, the opening fades back into resembling the floor to suggest it is being hidden again, but Sauron fades away as well. It should be that Sauron walks out of view, and then the opening fades back into the floor. (00:02:56)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Lykos departed the Savage Land in Magneto's aircraft, it only had one seat. Later in the episode after Sauron has abducted Storm, the aircraft now has two seats. (00:04:05 - 00:10:07)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Karl Lykos is climbing into the aircraft, the color of the lumbar section of the seat changes to a darker shade of yellow between shots. (00:04:06)
Savage Land, Strange Heart (1) - S3-E8
Character mistake: When Zaladane is placing the Garrok necklace around Karl Lykos' neck, she incorrectly refers to Garokk as "Garokkt." She's Garokk's high priestess, so she should definitely know his name. (00:04:12)
Savage Land, Strange Heart (1) - S3-E8
Character mistake: The sign advertising the New York City Comic Con has "NUFF SAIDI" written on the bottom. The second "I" in "said" is supposed to be an exclamation point. (00:04:39)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Lykos is walking by the museum, the lettering on the banner above the doors is spread out almost the entire width. When the shot changes, the lettering is now more compacted. (00:05:56)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Beast is quoting Shakespeare, his map is brown with yellow edges. When the shot changes, the entire map is brown. (00:06:26)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Lykos transforming into Kazar, his wings tear out of his jacket sleeves, and are incorrectly colored the same brown as the jacket. A couple of shots later, his wings have disappeared and don't form again until his entire jacket is torn off. (00:07:13)
Savage Land, Strange Heart (1) - S3-E8
Continuity mistake: When Beast contacts Rogue on her wrist communicator, you can see she is wearing the usual yellow gloves, green sleeves and brown jacket of her uniform. When the shot changes, she is wearing the long-sleeve blue shirt without gloves that she was wearing earlier in the episode. (00:07:40)
Savage Land, Strange Heart (1) - S3-E8
Audio problem: Storm's upper and lower lips are completely separated and her teeth clenched when she says "I am free!" She wouldn't be able to say the words "am" and "free" without touching her lips together. (00:12:20)
Savage Land, Strange Heart (1) - S3-E8
Revealing mistake: When Storm is saying "I am free," the flashing green effect on her eyes moves down to her neck when she tilts her head back. (00:12:22)
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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