Principle animation/photography was done at the now-defunct Will Vinton Productions in Portland, Oregon. Although injection molded foam characters had been in use for some time, this was the first time it was used for a series television show. This choice was an easy one, since character turnover and the less likelihood of damage to them if they were clay, as well as the tight production schedule made the production run smoother and more budget friendly. Will Vinton Prod. pioneered the Claymation and colored foam molding techniques. Like the Plasticine clay still used, the foam color is throughout, making repairs easier and less noticeable than in clay. If damage was severe to clay characters, a replacement was almost certainly needed, causing costly production delays and down-time. Foam core character could be made in quantities and various poses/facial expressions, so scene changes were fast and easier.
Although the PJs is modeled after the Brewster-Douglas public housing projects in Detroit, Michigan, the show takes place in the inner cities of Chicago, Illinois. This is revealed in "Smokey the Squatter".