Happy Turkey Day (Trigger 1) is actually a remake, the original version of Happy Turkey Day can be seen hidden on the first page of the Trigger menu. If you select above Trigger 1.
Some of the Triggers and Easter Eggs in the 'Triggers Compilation' use music from 'Eyeball' (1975). The special features main menu includes an excerpt from the 'Eyeball' (1975) trailer. The Easter Egg with Shaye puking includes a line from Palette Stone from 'Eyeball' (1975).