This thread made me want to go and hunt for more references to other Telltale games. I played Muzzled and found a reference to Bone: The Great Cow Race.
I updated My blog
with a screenshot of it.
I'm going to play through The Bogey Man next to see what I can find.
There's also a bunch of references to Wallace & Gromit shorts in the episodes. I'll have to play through and get screenshots for those too once I'm done.