During the pursuit of the 211 suspect, the speedometer on the motorcycle first reads about 30 MPH and in the closeup shot it is between 90 and 95 MPH.
The first crash is heard and Jon and Ponch look up at an overhead bridge or overpass. When thy take off the bridge has suddenly disappeared from sight. Upon arrival, the crashed vehicles are not even on a bridge.
The Kawasaki motorcycle on the freeway was supposed to be a runaway, but it slows down as it approaches Jon and Ponch then speeds up after it passes between them.
Neither the KZ900 or 1000 police motorcycles used hex nuts as shown to retain the front axle. Parts catalogs for both motorcycles list round headed collars that thread onto the axle and then are retained by pinch bolts on the bottoms of the forks. Since the pinch bolts were never loosened, it would not be possible for the axle to come loose as shown. In the event the axle did fall out, the entire front wheel would detach resulting in an immediate crash, not the wobbly wheel as shown.
Poncherello uses his right hand to grab the runaway motorcycle. Doing so meant he had to take his hand off his motorcycle's throttle, which would cause it to slow down and he would have fallen behind the runaway motorcycle.
Fido the dog steals a chocolate snack cake from Ponch and eats it. Dogs can get ill and even die when they eat chocolate. Ponch hides Fido the dog in a car without the drivers knowledge. This choice could place a dog in danger of getting heat stroke.
Within a matter of two blocks the pursuit of the Mercedes goes from a suburban area with trees to a downtown area with skyscrapers.
The 211 chase takes place on the Foothill freeway, yet seconds later the LA SO arrests the suspect on the Ventura freeway at Laurel Canyon Road, about 15 miles away.
Ponch calls in his location as the Harbor Freeway (110) southbound at the Vernon exit, yet the area they're in has a landscaped hillside, and no part of the Harbor Freeway, especially near the Vernon exit, looks anything like this.
Ponch and Jon have pulled over the dune buggy near CHP Central Station (in Downtown Los Angeles), and that's where they first witness the woman who runs a stop sign because she's ostensibly trying to get her husband, who has had a heart attack, to the hospital. Soon after giving chase, they are on the freeway, and when Ponch calls in their location, he says they're on the northbound San Diego Freeway. This makes absolutely no sense, as the San Diego Freeway is nowhere near Downtown Los Angeles. At the time (1977), there were two hospitals Downtown and three more just outside Downtown; why didn't the woman take her husband to one of these hospitals? And even if she were trying to get to a specific hospital in the San Fernando Valley, she wouldn't go all the way to the 405 to get there. Instead, she could take the 101 from Downtown.
After the Jon and Ponch stop the "frozen" motorcyclist he shows them his driver's license and then put it and his wallet in his helmet. Ponch holds the helmet as the motorcyclist walks away and Ponch doesn't stop him to give the wallet back.
Jon tells Ponch to try and kick the runaway Kawasaki motorcycle out of gear and he'd try to hit the kill switch. Japanese motorcycles such as the one shown used a sequential 4-up and 1-down shift pattern with neutral between 1st and 2nd gears, so it would not be possible to shift from 5th to neutral. A better tactic would be to try and disengage the clutch lever.
An officer is shown downshifting to overtake the runaway motorcycle. A KZ900 would already be in an optimum power range at freeway speeds, so downshifting would actually slow down the overtaking process as opposed to simply opening the throttle.