OT Continuity errors?

[sdp]

Not seeing Usagi go home or not seeing the turtles meet Scumbug doesn't mean it's a continuity error, only that we never saw it happen. Tempestra is a bigger mistake since she was pretty much dealt with it her own episode, a bigger question is not how Shredder knows about her but how she came back. I don't even know why she came back, she was a one off villain who wasn't that interesting in the first place and had closure in her own episode. Many other villains deserved that spot.