Alternating shots of the record player at the party show the multi-play arm on and off.
When Gerald is brought to the Juvenile Division to be interviewed, his parents are told to wait outside while Friday and Gannon take him into an interrogation room to question him. Juveniles are not allowed to be questioned by the police without their parents or a lawyer being present during the questioning.
During a long discussion while driving, Detective Gannon (Harry Morgan) is a bit overzealous with his steering wheel movement. Small movements and bounces are often pantomimed to create the feeling of movement in a still car which is filmed to be moving. Yet in this case, the gyrations of the wheel would have caused the car to swerve along the smooth road surface depicted if the car was actually in motion.