Canada, Eh?: Mike and the 'bots conjecture that the blob overlooks Canada in its attempt at forced disarmament, leaving the world quaking under a Canadian hegemony.
Creepy Child: "We're the Children of the Damned you've heard so much about."
Fan Disservice: Crow works out his trauma by hosting a Jackie Coogan fashion show, displaying sketches of the man in increasingly skimpier outfits.
Mike: C'mon Crow! Okay, so Coogan wore some goofy outfits in this movie, but can't we leave him with a modicum of dignity?
Crow:No! No we can't, Mike. I'm hurting, I've got to lash out, and we're going to see this thing through to the end! Next card! Here's the ultradignified Coogan getting a teensie bit naughty, in this French-cut thong singlet...
Budweiser jokes off of Bud's name. The best part is that, according to Mighty Jack's MST3K fan site, the kid who played Bud Brewster later married into the Heineken beer fortune.
Servo mentioning that the beach must be "where the children playeee-yay-yay-yay-yay!", in reference to Cat Stevens, along with Crow telling him to knock it off in various languages.
The crew also get a lot of mileage from The Professor behaving like a drunken jerk.
Plus there's the fact that after Pearl's attempt at videoconferencing, all Mike and the bots' riffing has a distinct echo to it.
Diets of hot dogs.
Shout-Out: During "Century 21 Calling", some stock music from William Loose and Emil Cadkin plays. Crow observes: "Ren and Stimpy music!"
Special Guest: The Blob From Heaven shows up on the SoL to convince Mike and the 'bots to get rid of their nuclear stockpiles. Turns out Servo kept a "neutron device" under his bed as a deterrent against "Uh... Well, you guys."