In the initial car chase the chasers lose a driver side front hubcap in an early turn. When they park at the apartment building to conclude the chase the hubcap is back in place. Later, when Willett and Stone follow Jim away from the bar the hubcap is missing again.
Early in the episode Rockford's license plate reads 835OKG instead of the usual 853OKG.
During the initial car chase Claire's Mercedes 450SL sounded like a 4 cylinder sports car. The 450SL is a V8.