Continuity mistake: The exploding playing card that Gambit uses to destroy a few Sentinels and draw the rest above ground is cleverly shown to be the ace of spades (also known as the death card in some folklore), but the card he is shown charging up before the Sentinels see it is the 2 of diamonds. (00:12:10)
Continuity mistake: When Gyrich is in the car trying to get Trask on the phone, he is shown to be sitting in the backseat on the passenger side (note the windows immediately to his right and behind him). When his driver crashes the car into a tree, Gyrich is shown exiting the car from the front passenger seat. (00:08:00)
Continuity mistake: When Trask turns the laser onto the propane gas tank, it is on Master Mold's left. When Master Mold reaches down to try and stop the laser before it causes the tank to explode, it is now on his right. (00:16:04)
Continuity mistake: When Rogue is calling out to Gambit just before Jean and Senator Kelly exit the mine shaft, the X logo on her chest is a yellow X on a red background, when it should be a black X on a red background. (00:17:57)
Continuity mistake: When Jean is using her telekinetic powers to rescue Senator Kelly from Master Mold's lab, she drops him on the floor in the middle of the lab. When Cyclops gets blasted by Master Mold after he and Jean run to grab Kelly, Jean and Kelly are suddenly inside the mine shaft. A couple of shots later, Jean and Kelly are now standing at Master Mold's feet. (00:15:42)
Continuity mistake: When Gambit is asking Xavier why the X-Men must all die to save Senator Kelly, the top of Wolverine's mask is incorrectly colored blue. A few shots later, this portion of the mask is correctly colored yellow, but then the portion of his mask by his right cheek is also yellow, when it should be black. (00:09:48)
Continuity mistake: When Master Mold is telling Trask that mutants are humans, Trask's right hand is raised near his face. When the shot changes, his hand is suddenly lowered at about waist-level. (00:15:11)
Continuity mistake: When Trask's voice is first heard coming from Gyrich's cell phone, the phone is in the top left corner of the floor tile. When the shot changes, the phone is now in the center of four smaller tiles. (00:09:12)
Continuity mistake: When Gyrich's gun slides over next to Cyclops' feet after Wolverine tackles him, you can see Cyclops, Rogue, and Storm are standing at the entrance of the Lincoln Memorial. When the shot changes, the three are no longer near the entrance. (00:09:07)
Continuity mistake: When Beast is first shown in his prison cell, the X logo on his waistband is black with a red background. When Jubilee hugs him, it is now a red x on a yellow background. (00:19:51)
Continuity mistake: At the beginning of Senator Kelly's campaign speech, his campaign button is predominantly white with some blue at the top and bottom. When the shot changes, the majority of the button is now blue, with only a small portion in the center being white. (00:19:20)
Continuity mistake: When Jubilee is saying how much being a member of the X-Men means to her, one shot shows Gambit looking despondent, and the lines on his collar armor are missing. (00:10:53)
Continuity mistake: When Wolverine is telling Jubilee that she isn't going on the mission, the parts of his mask next to his cheeks are yellow, when they should be black. (00:10:41)
Continuity mistake: When the X-Men are flying to where Magneto is, the sclera of Gambit's eyes are colored white, when they should be black. (00:04:37)
Continuity mistake: When Cyclops is running through the mine to search for Wolverine and Gambit, he uses his visor to track their location. When the shot changes to a first person view through Cyclops' visor, the background is merely moving up and down. If he was running as the previous shot had shown, the objects in the background from his point of view would become larger as he got closer to them. (00:16:50)
Continuity mistake: Jubilee destroys a Sentinel by tricking it into colliding with a train car full of tar and then using her powers to blast the car and cause tar to spill all over the Sentinel. After Jubilee is rescued by Rogue from the Sentinel that grabbed her from behind, the Sentinel that Jubilee destroyed, as well as the train car, have disappeared. (00:13:20)
Continuity mistake: When Magneto is battling the Sentinels after they have rescued Senator Kelly, bandages suddenly appear on Magneto's right arm, something that's not supposed to be there until after the X-Men have rescued Magneto and patched him up. (00:04:25)
Continuity mistake: Magneto reveals to Senator Kelly that he went to Washington, DC to personally witness his assassination. The flashback to the previous episode reveals that Magneto was watching Mystique (masquerading as Gambit) attempt to assassinate Kelly and the real Gambit's intervention through a window. Magneto can be seen as plain as day watching in the window in the flashback, yet in the actual episode, Magneto is never there. The design of the window is also different, as well as the color of the curtains. The room itself also appears to be smaller in the flashback.
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 ★