When the Ghostbusters are chasing Lothgar in a small firetruck, Peter is in the back, wearing a clown costume. In one shot shown from behind, Ray is colored like Peter (with Clown Peter also visible) and in another shot, Ray and Winston (who is driving) switch positions. When the truck comes to a stop, Ray changes from his normal colors into a copy of Winston, showing two Winstons in the same shot.
During the final confrontation with Lothgar, Peter's clown nose disappears and reappears several times.
Peter is trapped in a candy cane prison but when Slimer eats the candy to free him the bars are brown. They return to the red and white color after he finishes eating.
Winston's hair appears blue in several scenes, instead of his normal black hair.