IIRC Twister's match DMD animation has raptor claw from Jurassic Park flying by. Maybe some other things too, I know there's a boot or something, but I've not seen it in a while.

1965 Gottlieb Hi Dolly includes references to seven other Gottlieb games in the backglass:

http://ipdb.org/machine.cgi?id=1158

not sure if it is a real reference, but here goes

The Simpson's Pinball Party - Comicbook guy "Worst ball ever"

Wizard of Oz - Wicked Witch after second TOTO wave (guards throwing the spears) "Worst spear throwers ever"

maybe it is Keith Johnson reference instead (same programmer)

On Champ, Mini Zag is one on the backglass. Round up is on one of the playfield plastic. Maybe On Beam is on the BG as well.

Popeye saves the World had reference to Creature from the Black Lagoon. If you tilt table, Oyl says "You're not gentlemen!".

If you can look closely in Party Zone backglass, you can see one of Trogs (one-eyed cavemans) from Trog! (Midway's arcade game) among Party Monsters.

Stern Sopranos -Just the other day I was playing and hit the fish shot and it said "Gone fishing - Leave a message". Unless I was dreaming.

Chris

GTB Bowling Queen has folks playing pinball on the backglass.