The license plate seen on Paul's black Thunderbird reads "KGF 760." Yet, when Paul and Lt. Tragg are in the police detective's office, Tragg says that Paul's license plate is "LTZ 413." (BTW, Paul does not correct Tragg.)
A scene set outside the Norton mansion late at night was obviously shot during the daytime.
At 27:54, the camera crew, light board, boom mic, camera, and dolly tracks are reflected in the side mirror of Paul Drake's Thunderbird.