Continuity mistake: When Xavier and Magneto are trying to escape from Vertigo, Xavier cuts the ropes of the bridge they are on, leading him and Magneto to swing into the cliff wall and hop down safely to a ledge below. When they look back up at Vertigo, she is at roughly their 10 o'clock, with the other side of the bridge by her feet. Considering that they just dropped down onto the ledge and have only moved a couple steps to their left, the other side of the bridge should still be directly across from them. (00:15:45)
Other mistake: Julianne Klemm, the writer for this episode, has her first name misspelled in the opening credits as "Julaianne." (00:02:07)
Continuity mistake: When the Danger Room monster has ensnared Cyclops, the slime coming off its tentacles is green. When the shot changes, the slime is orange. (00:02:18)
Continuity mistake: When Gambit is asking why Cyclops wants his Danger Room session to be tougher, there is a microphone a few inches from his mouth. When the shot changes, the microphone has disappeared. (00:02:44)
Continuity mistake: When Gambit answers the phone, he brings it to his right ear with his right hand. When the shot changes, he is holding it to his left ear with his left hand, and he is also facing the opposite direction. (00:02:53)
Revealing mistake: When Gambit bumps the toggle switch that increases the Danger Room difficulty, you can see it actually moves itself before his elbow touches it. (00:02:55)
Continuity mistake: When the Danger Room doppelganger of Omega Red confronts Cyclops, its left arm is pointed down. When the shot changes, its left hand is raised at almost shoulder level. (00:03:01)
Continuity mistake: When the Danger Room alarm is beeping to notify Rogue that Cyclops is in danger, in the first shot, the control panel for the alarm consists of the screen and rows of buttons below it. When the shot changes, about half the rows of buttons have been replaced by what appears to be a phone. (00:03:57)
Other mistake: When Rogue drops the mug of coffee onto the floor, you can see that the coffee touches her boot, yet her boot does not get any stains on it. (00:04:05)
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 ★