When Dana is at her apartment ptting groceries away, next to the eggs is a bag of…Stay Puft Marshmallows!!!
Also when the containment unit is shut off and they show the city sky line there’s a billboard that advertises the STay Puft Marshmallows!
Just thought it was funny.
Well… not really easter eggs… at least not in the conventional sense.
The Stay Puft foreshadowing has been well documented these days.
Speaking of which… does anyone know if there ARE any Easter Eggs, in the conventional sense, on these dvds? 
Just the trailers on the Ghostbusters DVD (American)
I always thought the Twinkie dialogue was sort of a hint of the things to come. That is, the food/snack item that becomes “big.”
Dale, I had never thought of that one! Decent foreshadowing idea I think.