Marilee Phelps, who plays Virginia, the undercover policewoman whom Carl (Adam Williams) takes on the long ride, was Adam Williams' wife at the time this movie was made. Lee Phelps, the uncredited actor who plays "Doc," the police coroner, was Marilee Phelps' father (and Adam Williams' father-in-law).
After the film "The Crowd" (1928), this the first film where a toilet is shown, when the murderer burns his torn jacket.
In the scene where the policeman was being questioned, he called in the radio report to KMA367, which is the main radio call of the Los Angeles Police Department Parker Center on Los Angeles Street in downtown Los Angeles.