Both Jim Castelli and Sol Weiner are identified in the film's credits as "Cop." Castelli is the cop in the ambulance while Weiner is the cop chasing Frosty (later on in the film).
A key piece of music entitled "Venus," which serves as the film's theme song, can be found on the 1972 album "The Best of Jean Bouchety." Four years prior to the film's release in 1976.