The last episode just aired.

It did look like the series finale but aren't they still showing new episodes? They just rubbed out Porn-man, Afro-man, and Charlie Plunt in last Sunday's episode.

I've only seen a few shows, so I don't know if that is the only time that has happened - but I noticed that when Kevin says "Goodbye, Alan" his mouth actually moves instead of just being a flat line. Is it a special tribute for the last show? If yes, who provided the voice?

I thought the ending with Alan the Magic Goose ranting on a couch in a psychiatric hospital was a great final twist.

"What fun is it being cool if you can't wear a sombrero?"