When Ponch drives Paula to the construction site after their date, he parks his car close to the curbside. His front right tire is clearly seen parked in mud. Yet when they both exit from the car moments later, the car is set further away from the curbside and the mud disappears. However as Ponch finally drives away, the mud makes a reappearance.
The AMC race car blew a front tire. When the race crew steals the tires after that happened, they steal larger slicks that are mounted on the rear wheels and would not fit the front wheels.
Difficult to steal slow-moving heavy equipment in broad daylight around populated areas.
When Gertraer handcuffs the suspect in the dragster near the end, he reaches for handcuffs in the leather pouch that holds the batteries for their microphones instead of the handcuff pouch and the handcuffs are never visible on the suspect.
As Ponch and Jon arrive at the racetrack, it is clearly at night. Yet they both arrive wearing their sunglasses. The rest of the squad are fixing their drag star and have to use a torch to see what they are doing as it is dark.
When the driver of the getaway vehicle starts the Ford van, he uses his left hand to turn the key. The key is mounted to the right steering column. To use his left hand would require him to be a contortionist.
Harlan when describing the stolen parts lists a tunnel ram, a dual quad intake, and carburetors. A tunnel ram is an intake that holds dual 4-barrel (quad) carburetors, so he stated the same part twice.