Nick heroically jumping into Robertson's plane —complete with one-liner— and instantly whizzing it:
Nick:You're grounded! [Gets punched in the face.]
Crow: ...And it's all over!
Tom: "...But I chased you on a horse! I'm supposed to wi-hi-hin!"
The bad guys pulling over and picking up bikes to continue chasing Nick:
Tom: Aha, so it's bicycles then, is it? We accept your choice of vehicle! Enguarde!"
The guy who comes out running after Nick when his car is stolen:
Tom: "Wait, the clutch kinda sticks, and one door doesn't close, and you have to jiggle it to get it into reverse!"
"Funny Aneurysm" Moment: Mike and the Bots mock the "future" world of 2041, as the only things that seem different from the present day (1994) is that the children are fatter and they all have cell phones. I Want My Jetpack, indeed.
Hilarious in Hindsight: The film's showing on MST3K actually did cause Castleton State College T-shirts to become popular with the fandom. The Nick Miller haircut still seems less popular, though.
Servo: So, fifty years from now it'll be... three years from now.
Mike: (flatly) The, uh...future.
Fridge Horror: In the alternate Eddie timeline, Joel leaves his robot children with an outwardly abusive asshole instead of a nice Every Man. And presumbly hasn't tried to rescue them from Eddie yet...