Board Thread:Site Problems and Appearance/@comment-5475153-20150123031954/@comment-4854965-20150207201632

I think the shorts are canon. There's a decent amount of overlap with the shorts and other stuff. Examples:

1) Lefty was originally a short but was pictured in 2x07

2) The Candy Monster was in a short, but was actually first seen in the first DVD release (inside the little Book 3 pamphlet)

3) Stan's Tattoo...nuf said.

And there's plenty more stuff, but those are just the first few that came to mind