I am also working on my dubs of the alternate versions of the X-Men Animated series..
There were many production delays leading up to the premiere of X-Men in the fall of 1992. The show was originally going to premiere over the Labor Day weekend at the beginning of September, but it was soon pushed to the end of October. The "Night of the Sentinels" two-parter was rushed to the air and billed as a "sneak preview" even though it truly wasn't ready for broadcast. Consequently, there were many animation errors in these two episodes. However, they were corrected when FOX re-aired the pilot in early 1993. The original version has never been rebroadcast, so the following deleted scenes, changes, and additions cannot be found on any VHS release or ABC Family Channel rerun.