When the Ghostbusters drop into G.B. for the second time in one night, Eddie is missing his newly acquired facial hair.
When G.B. time-warps back to 1986 at the end of the mission, the dog kennel he is pulling is not visible in the vortex.
When Prime Evil threatens to shave Fangster's body, instead of drawing the werewolf shirtless, they simply gave his shirt the same color as his fur, but left the sleeves and collar in place.
Jake appears to have forgotten Fuddy's name, as he keeps referring to him as 'The Wizard' only.