Hobbes: Why wait till tonight? Calvin: Hobbes the good part of the movie happens then. Do you want to RUSH through the movie? Hobbes: No. Calvin: Good. Then we'll wait for tonight.
Then there's an absolutely fourth-wall shattering exchange in Chapter 8, where Calvin and Tracer's brawl interrupts the movie. It takes quite a while, and the news guy ends up undergoing some Sanity Slippage.
"Welcome!" Calvin yelled. "In this bonus chapter on um... What's this place called again?" "Fanfiction." Hobbes yawned. "Oh yeah. ...On Fan-friction, you'll see a trailer for CALVIN AND HOBBES III: DOUBLE TROUBLE, a soundtrack for songs, and a quick preview! I hope ya like it!"
Susie was playing on the sidewalk with Mr Bun. She was performing a ritual known to us only as "THE TEA PARTY". That's not me talking by the way, Calvin slipped it in while I wasn't looking.
Then there's this:
Calvin: But anyway, if this is a UFO, it has to have some kind of Escape Pod or something! It's in the rules! Hobbes: It is? Calvin: Plus this chapter would be extremely boring if we just sat in a cell all day.
Tracer: Who's Earl?
Calvin: The ship captain! Didn't you know that? Spiff: Not really. He wasn't called Earl until the end of the second movie.
Calvin: Now hurry up, and go! We're running out of room for this chapter!
"Nothing like a bunch of drama to get the movie going, huh Hobbes?"
"And if we'd known that trick in the first place, this movie would've been shorter."