OT Continuity errors?

[Jukka]

Sorry if this has been brought up. Tried looking for it but couldn't find.

I'm curious about what are the OT continuity errors known in the fandom? And have they been addressed by any writers/creators working on the show?

One thing I recently heard, was that the flashback of Krang in DimensionX with others of his kind all having small robot-walkers is considered an error? (The Four Musketurtles)
...personally it's a bit of shame, as that's one episode I saw many times as a kid, and while it's not the best episode out there, I do like when they give flashbacks to characters. And it has stuck with me that there are other Krang-like creatures with walkers.

But getting back to the topic.

What OT continuity errors are there? Infamous or subtle ones?