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Factual errors
After diving into the snake pit to save Connie Swails, Pep takes a handful of pills from his pocket and pours them into the snake's mouth. Capsules of this nature are water-soluble and after spending several minutes underwater in Pep's pocket ,they would have dissolved into a goop. The pills that Pep gives the snake are dry.
When Joe is eating his chili-dog, he sits down with both covered in chili, but when he takes his first bite it has almost none.
When Pep rescues Friday from the PAGANs at the Observatory, Joe picks up a Beretta 9mm pistol. But when he turns to shoot back at the hoods before hopping onto Streebeck's bike, Joe is firing what appears to be a 1911-style .45 auto.
When Pep is pretending to be one of the P.A.G.A.N's pouring gasoline onto the Bait magazine pile, smoke can be seen long before it is lit by the cigar.
Driving to the station after the pagan rally, Joe Friday says it is January 9th. After talking to their superior officer he says that it is January 8th.
Joe is alternately wearing/not wearing a seatbelt when sitting in the car talking to Connie (before Emil turns the car over).
The police commissioner has no authority to relieve Joe Friday of his duties. The commissioner is a civilian appointed by the mayor and serves usually on a part-time basis. Commissioners can only advise the police and serve as the voice of the people. They can only act as a group. The Captain had the authority, but he would have had to explain his actions to his superiors. The ultimate decision would be handled by a trial board which reports directly to the Chief of Police.
At the zoo the zookeeper says the snake next to the anaconda enclosure is a boa constrictor. In fact it is a Burmese python.
As they are driving to the rally, Friday narrates that they were issued "one distressed 1985 unmarked Ford sedan." The car they are driving is a Ford LTD S (as evidenced by its "wedge" turn signal and one square headlight on each side), a model discontinued in 1982.
After diving into the snake pit to save Connie Swails, Pep takes a handful of pills from his pocket and pours them into the snake's mouth. Capsules of this nature are water-soluble and after spending several minutes underwater in Pep's pocket ,they would have dissolved into a goop. The pills that Pep gives the snake are dry.
When Friday and Striebeck are chasing Muzz they have a rotating red light on the dashboard. California vehicle code requires a steady burning red lamp capable of being seen at 300 feet for Code Three operations.
When Pep is watching his "television watch," there is no time or date on any of the counters. They are all on zero. However, the watch could be on Stopwatch mode.
When Streebeck takes Friday to the strip club for coffee, he asks Friday to lend him $20 to give to an informant. Later, just before Friday is jumped by the street thugs, he complains in the narration that he had to loan Streebeck $50. Streebeck has likely merely borrowed additional funds in the intervening time not shown onscreen.
When Streebeck begins "reading" the PAGAN manifesto, he begins reciting the manifesto before opening the cover of the booklet.
As Joe and Pep are driving through a tunnel toward the end of the movie, the internal shots of the car show them passing shops while they are in a tunnel.
During the raid on the drug facility/milk processing plant, the liquid that spews from the pipes and drums turns out to be milk. However, it is obviously not milk, not even skim, as milk would be a more solid color of white, as opposed to the nearly transparently white colored water that we see.
After the shoot-out at the Caesar mansion, as Pep and Friday drive away a marble statue can be seen with very neat bullet holes through it. Due to the structure of marble (or any stone), bullets would not simply punch a smooth-edged hole in it, they would break chunks off. That the hole is black shows that the statue is also hollow and obviously a prop.
Cables used to pull the fiberglass cow from the roof of the "milk factory" can be seen as Friday and Streebeck ram the door
When Friday and Pep are racing to the airport in the Ford Police Car, a camera is visible in the back seat in some shots.
In the scene where the LAPD Ramming Tank is cutting a swath through the milk factory, if you look closely in the very back of the warehouse, you'll see two men in yellow jumpsuits and gas masks standing and watching the tank cut across a line of pipes. When Joe and Pep emerge from the tank, they are wearing yellow jumpsuits and gas masks. The two men in the background observing the action shot may or may not be Dan Akyroyd and Tom Hanks watching the stuntmen driving the tank in the scene and waiting for their turn to shoot their scene of them emerging from the tank.
In the scene after Joe, Connie, Pep, and Joe's Grandmother leave The Brown Derby separately, Joe is seen taking Connie to an overlook that is under the Hollywood sign. Though the approximate size is about right (around 300-310 feet long), there is no place to park below the sign.
When Joe Friday and Pep get Captain Gannon and the Commissioner to go to the site of the PAGAN event, Friday's narration indicates they met at 5:45 a.m. on a date in April. In Los Angeles, the average sunrise time in April is about 6:10 a.m.
When Joe and Connie are kidnapped by Emil, they are in Joe's police issue Yugo. When Joe is rescued by Pep at the observatory, they escape the PAGAN goons on Pep's motorcycle. At Jerry Caesar's mansion, Pep tells Joe to go home, to which we later see Joe driving down the road in a beat up Mustang. However, since he obviously got to Caesar's mansion riding on Pep's bike, there is no explanation as to why or how Joe got a hold of a Mustang to drive home.
Emil Muzz is arrested multiple times and reveals all to the police including the PAGAN Festival yet he remains in charge of everything with Rev. Whirley.
Friday & Streebeck call for backup (or at least Joe Friday attempts) to pull over one person (namely Emil Muzz) but not when they go undercover at the Pagan festival where they were severely outnumbered.
Sgt. Friday is suppose to be a by-the-book "never break the rules" cop, yet in the opening scene as he is pulling up to the police station Friday parks in front of a fire hydrant and gets out. Parking in front of a hydrant is still illegal in California.
When Friday and Streebeck first meet, Friday chastises Streebeck for his lack of adherence to the department dress code. Streebeck did not explain that he was just coming off of an undercover assignment.
After stopping the PAGANs at Caesar's Mansion, Jerry Caesar walks up to Joe Friday and offers to repay him by giving Friday a lifetime subscription to "Bait, Dollies, and Field and Cream". Yet when the PAGANs are torching the magazine warehouse at the beginning of the film, there is a large sign on the side of the warehouse that shows the magazine titles in Caesar's line as "Bait, Field and Cream, and Cable Girls". "Dollies" isn't mentioned.
When Friday and Streebeck's patrol car is blown up, they are aiming their guns in the air instead of at street level, where there would be a better likelihood of danger or an ambush.