When Reed and Malloy get the radio call to go to the officer involved shooting, there is a car behind them. When the scene changes to an outside view of their car, there is no traffic behind them at all.
Stenzler and Walters are driving patrol car 80789 when Stenzler is shot. Moments later Off. Russo pulls up to the deuce scene to speak to Malloy in the same car.
Field sobriety tests of "FSTs" is not a "two and done" test lasting less than one minute as depicted but a series of tests the officer uses to assess the person's ability to mentally focus and perform basic tasks. Miranda Rights are not necessary since all California drivers agree under the "implied consent law" when their license is issued to perform these tests when accused of driving under the influence. Refusal results in automatic suspension of up to one year.
When the red Ford pulls away from the curb, the abandoned yellow Buick that Malloy referenced earlier to check on is seen parked here now.
In the last scene, Reed and Malloy pull away from the phone booth in front of the gas station. As the camera pulls back, the station's real phone booth is visible on the side of the station.
The final shot, of Adam-12 pulling out of a gas station, was also used in You Blew It (Season 1, episode 18), about 16 minutes into that episode.
Prior to arrival officers on-scene would provide first aid to all victims and suspects until EMTs arrive on-scene. Gunshot wounds usually bleed but no one was applying first aid to Officer Stenslers wounds.except to loosen his collar.
As Malloy and Reed are leaving the shooting scene, Malloy says, "Take care, Bill" to Officer Jerry Walters played by William Stevens.
When Walters is briefing Sgt. MacDonald about the shooting, he said the suspect ducked behind that blue Dodge. The vehicle in question is actually a Ford.