When Malloy and Reed pull over a car (after the bar scene), they turn on their red roof lights to initiate the stop. As they come to the stop by the curb, the red lights are off. The next shot shows Malloy and Reed questioning the driver, but in the background the red lights on the patrol car are on again.
While in the bar, Cal's Joynt, Officer Malloy is punched in the face by a patron sitting at the end of the bar. You see the punch from Malloy's point of view and it appears he gets hit squarely in the nose. Subsequent shots of Malloy that happen during the rest of the shift show no discoloration, bleeding, or evidence of having been hit in the face by a man's fist.
The overhead shot of Adam-12 pulling out of the gas station (about 16 minutes in) was also used as the final shot in Season 1 Episode 5 (You're Not the First Guy).
All the in-car shots of Reed - in day and night scenes - are out of focus.