The entire cast and crew of Perception worked for free - including the producers, writer/director, DP, and lead actors.
Perception shot on location in the dead of winter in New York City, enduring as many as 18 solid hours of exterior location shoots in 10-degree cold without so much as a bathroom or hot cup of coffee. Despite this, nowhere in the film can you see an actor's breath.
Chocolate syrup was used as blood in scenes shot in black and white.