The final scene involving the simulated murder of a cast member was shot much later than the rest of the film at the behest of the film's distributor.
The interpolated murder sequence at the end of the film was shot in the New York production studio of adult film director Carter Stevens.
The voice of "Carmela" was dubbed in by Roberta Findlay and is uncredited. The Carmela character is seen here in archive footage from The Slaughter (1971).
The voice of "Max Marsh" was dubbed in by Michael Findlay (who also plays the detective). The Max Marsh and detective characters are in archive footage from The Slaughter (1971)