Board Thread:General Discussion/@comment-4224349-20150402230801/@comment-28828302-20150405130148

LandenMaster wrote: Actually, guys, believe it or not, this IS canon. We got a tweet from one of the show's creators - basically, somebody said how much this idea sucked and the creator retweeted it with the response "Well, too bad, because this episode is one of the best so far and it's 100% canon." If he was just kidding, it's not canon. If he wasn't kidding, it's still not canon.

If it is 100% canon, then "Don't worry kid, none of this is canon" was canon too, so it means Uncle Grandpa used his magic powers to erase the episode from continuity.