Revealing mistake: When Wolverine, Storm, Rogue and Gambit are walking down the stairs to the subway station, you can see that they aren't actually descending the steps, but walking on thin air. (00:11:10)
Continuity mistake: When Gambit is saying "Scott and Jean pick one strange romantic hideaway," the encircled X on Rogue's right shoulder is entirely red, when the X and the circle around it should be black. (00:11:39)
Continuity mistake: When Gambit is saying "Someone may be tracking us," the snaps on both shoulders of his jacket are colored blue, when they should be the same brown color as the rest of his jacket. (00:11:45)
Revealing mistake: When Gambit and Wolverine are pinned to the wall by Tar Baby, Gambit's face somehow gets between the tar and his right shoulder when he is saying "Sticky situation, mon ami." (00:12:01)
Continuity mistake: When Storm is blasting down the door to the small room Jean is captive in, there is a small vent cover to the left of the door. When the shot changes, the vent cover disappears, and then reappears in the next shot. (00:12:33)
Continuity mistake: When the X-Men discover Jean and Annalee in the small room, neither Jean or Annalee are casting shadows on the wall behind them. When the shot changes, their shadows are now on the wall. (00:12:37)
Continuity mistake: When Wolverine punches his lefthand claws into the wall, it is at bottom of a slab of concrete, and to the left of where four slabs intersect. When the shot changes, the puncture is now closer to the middle-right area of a slab. (00:13:16)
Continuity mistake: When Jean is saying "Where am I? What's happening?", she has a lock of hair draped over her left shoulder that suddenly turns a darker shade of red. (00:13:26)
Continuity mistake: When Wolverine is saying "Cyke has his problems, but he don't smell like a Morlock," Gambit's bare neck is visible, when it should be colored black because of his headgear. (00:14:11)
Continuity mistake: When Wolverine is slashing at Callisto's staff, it is light purple. When he completely shreds a center portion of it, that portion is blue, and when the shot changes, the rest of the staff is red. Additionally, the center section of the staff has reduced in length after Wolverine shreds it. (00:14:35 - 00:15:03)
Continuity mistake: When Rogue is checking on Gambit, the black X's on a red background on both of her jacket sleeves are colored entirely red. (00:16:02)
Continuity mistake: When Rogue is flying Gambit back to the mansion, the green sides of her uniform above her belt are incorrectly colored yellow, and Gambit's neck is bare, when it should be colored black because of his headgear. (00:16:14)
Continuity mistake: When Wolverine finds the unconscious Cyclops, Cyclops' sleeve is rolled all the way down. A couple of shots later, the sleeve is now rolled halfway up. (00:16:42)
Continuity mistake: When Wolverine returns to Storm and Jean, you can see no-one is in his immediate vicinity. A couple of shots later, Callisto and Annalee are standing by the tunnel entrance, a few feet to Wolverine's left. (00:17:05)
Continuity mistake: When Wolverine returns to Jean and Storm after finding Cyclops, he is standing in the opening of the tunnel. When the shot changes, he is standing near the ladder that was several feet behind him in the previous shot. (00:17:05)
Continuity mistake: When Callisto is saying "Now, for the animal," part of Cyclops' brown pants briefly turn white. (00:17:13)
Continuity mistake: When Wolverine drops Cyclops to the ground, Cyclops' body is at a roughly 45° angle to the tunnel entrance. When Jean intervenes, Cyclops' body is now parallel to the tunnel entrance. (00:17:19)
Continuity mistake: Callisto's staff is roughly the same length as her body. When she is holding the staff to Cyclops' throat, only the bottom quarter of it is visible, when the rest that isn't obscured by their bodies should be visible and pointing outwards at her left. (00:18:06)
Continuity mistake: When Storm and Callisto are about to engage in combat, they are using staves that look like lightsabers, with the hilts at the bottom. When they start striking at each other, both staves now resemble a double-edged lightsaber, with the hilt in the middle. (00:18:25)
Continuity mistake: When Storm is offering the Morlocks sanctuary at the mansion, several of the Morlocks that were standing dozens of feet behind Storm in a previous shot are now standing in front of her. They are then behind Storm again when she is helping Callisto to her feet. (00:18:58 - 00:19:45)
Answer: It appears a number of factors led to its demise. It was originally intended to air for 65 episodes, but its popularity extended that. However, there were continual production quality problems, issues regarding whether the content was suitable enough for children, as well as financial considerations that finally led to it being ended.
raywest ★