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It isn't much, but when the bloods are getting revenge at Jimmy's house, from the inside view, the door is only torn apart, but from the outside view the door is completely gone. Also, when the crime scene investigation begins, you can see the inside of Jimmy's house, yet later the inside is black.

Plus, in the Legion of Doom, Dougie is not seen from the back, yet Butters talks to him from the front. From the back Butters is sitting next to Doc Octopus (Or something like him) and a large grey person.

Not much, huh? I would say those are pretty astute observations. Sure, it's not as big an error as, say, having a character die and then show up in a later episode, but... Oh wait... Never mind.

Sometimes I think Matt and Trey intentionally make errors in order to make watching the show more interesting, and sometimes I think they're just lazy (see: Crab People), but an error is an error, and you are correct in pointing these out.

About this episode, I noticed that Jimmy was called "Jimmy Swanson"
but in every previous series he appeared in, he has been known as "Jimmy Valmer"