After the officers gear up for the final battle, in nearly every shot of them approaching the supermarket, the sound of guns being cocked is heard, even though no one is actually cocking a weapon. Further, there's more cocking than there are guns in the scene.
Sgt. Angel is meant to be the best of the best so far as Police Officers go yet he is often seen with his handcuffs the wrong way round. If he removed his handcuffs as he has them he wouldn't be able to apply them as the fixed double bar would be facing the suspect's wrist as opposed to the movable single bar.
UK police officers' pocket notebooks are official documents which must be turned in when full. Officers must use black ink (Sgt. Angel uses blue throughout the movie), use every line on both sides of every page (Neither Sgt. Angel nor PC Butterman does this), and the cartoon flip book would certainly not be allowed.
During the introduction whilst Sergeant Angel's life in the police is summarised, he says that he was stabbed by "a man dressed as Father Christmas," and when he knocks on the door, you see a scar on his right hand, with which he is knocking, but the flashback of him being stabbed shows "Father Christmas" stabbing him in the left hand.
When Sgt. Angel uses the air gun to shoot the small human shape targets in the fundraiser event to repair the church roof. He is seen hitting them all making then go down one by one but when the camera angle changes to show the reaction of Dr. Harris to the shots, the targets are all standing upright right behind him. Soon after Danny accidentally shoots Harris with the air gun and when paramedics are taking him away, we can see that all the targets are down again on the background.
When Sgt. Angel first approaches his room at the Swan hotel, the camera lingers momentarily on the room door's prominent sign which reads "CASTLE SUITE". Angel hangs up his jacket on a hook, but seconds later he decides to leave. Angel removes his jacket from the hook and opens the door to leave - and the "CASTLE SUITE" sign is gone.
When PC Doris Thatcher comes in bringing PC Danny Butterman his birthday cake she is wearing fake boobs over her sweater, seconds later the fake boobs are gone even though she is holding the cake with both hands.
When Danny and Nicholas are trying to put the pieces together, just before Frank enters the room, Danny says "Maybe they were all accidents." In response to this, Nicholas puts his arms on the desk and rests his head on them. When Nicholas gives a small laugh a few moments later, it changes to a close up of him and his arms are at his sides with his head directly on the desk. The change of shot was very quick, with no time for Nicholas to move his arms.
After Frank gets away from Danny at the model village near the end of the film and takes Danny's Police car, he drives the car through a fence into a very large, empty field. After the swan attacks Frank in the police car, it shows Danny and Nick watching from the model village as Frank's car careens into a tree in a much smaller field. For some reason they filmed this sequence in two separate locations.
When the officers are pushing the shopping carts to ram the meat counter, it shows Doris and Sgt. Fisher standing off to the side providing covering fire and when the officers pushing the carts go by they fall in behind. In some subsequent shots Doris and Fisher aren't there and in another they are just falling in behind when they should have already been there.
When Sgt Angel is arriving in Sandford, his cell phone clock shows the time as 20:52. Later, when reviewing the CCTV footage of him passing the hoodies sitting on the fountain, the timestamp shows 20:34.
When Nicholas and Danny stop Martin and Eve for speeding, Eve is playing with her hair when Martin says, "I'm playing the eponymous hero." In the next shot, from the front, both her arms are by her sides nowhere near her hair.
When Danny takes Nicholas away from the village and gives him his car, Nicholas is seen in the boot (trunk) of the car. After he gets out, neither he nor Danny close the boot, but it is closed when Nicholas drives away.
When the mine starts to tick in the barn causing everybody to run outside (42 minutes in), you can see Nicholas exit the building twice. He runs out first, followed by the German Shepherd. Then the camera cuts closer showing the dog, Arthur, Danny and finally Nicholas pass the doorway.
As Cadet Angel is taking his test at the beginning, the hand shown holding the Parker Jotter does so with index and middle finger gripping the top of the pen; later in the movie, when Sgt. Angel is shown writing (with Simon Pegg's face visible), he is holding the pen with the index finger on top and middle finger curled under.
At the church fete, Nicholas has a go at the rifle range and proceeds to knock down a row of targets in quick succession. The only problem with this is that an air rifle actually only holds one pellet at a time: Nicholas would have had to reload the gun after every shot which he clearly does not. Similarly, Danny takes the gun after Nicholas has fired it and accidentally shoots Dr Hatcher in the leg, something he shouldn't have been able to do; having just been fired, the gun chamber would be empty.
When Nicholas and Danny are getting ready to leave for the day, having stopped Martin Blower for speeding earlier, the clock behind them says 7.10pm. When they leave the station a few moments later, Frank stops them to give them the theatre tickets. The starting time on the tickets says 7.15pm which is the time it was then. Nicholas and Danny should have missed the show.
On his first evening at the pub in Sandford, Sgt. Angel decides to verify the age of several seemingly underage boys drinking alcohol. When he approaches the second table, he points his finger at the boy on the left, meanwhile, on the next shot, he points his finger at the boy in the middle.
When the kids spray-paint the lenses of the CCTV cameras, the CCTV monitors show the colour of the paint that was sprayed on. In fact, the monitors would show only the colour black because no light would be reflecting back from the painted surfaces.
When Nick and Danny confiscate the vast arsenal of unlicensed weapons from the farmer they don't arrest him despite the fact that possession of guns such as pistols in the UK would be highly illegal and earn the man many years in prison.
When Angel goes to a crime scene to talk to his girlfriend Cate Blanchett, who is a Crime Scene Investigator (CSI), the room is packed with CSIs, at least 8 of them. In real life there would not be this many in a small room like this and, as Nick Frost points out during the DVD commentary, it could even spoil the physical evidence they're trying to collect.
In the scene inside the church just after Tim Messenger is murdered, Frank Butterman tells Doris Thatcher to "get the CSI down here". 'CSI', standing for 'Crime Scene Investigators' is an American term, the British equivalent being 'Scene(s) Of Crime Officers' or 'SOCO'. However, this may have been deliberate, as, due to the TV series, the British public are likely more familiar with the term 'CSI'.
When Nick arrests Danny for drink driving he simply throws him in a cell and leaves him to be dealt with in the morning when he has sobered up. In reality he would have had to book him in with the custody Sergeant, establishing his identity and taking mugshots, fingerprints etc before making him take a drink drive breath test to see if he was over the limit.
When the mine detonates at the end of the film, the prong sinks into the mine. The prongs of a naval mine are made of a soft metal (usually lead), designed to bend, not sink in, on contact with a ship's side.
Whilst sitting in the lay by monitoring traffic speed, Angel calls out the speed of one passing car as "40", yet when they stop Blower's car, they write him up for traveling at "48 in a 30 zone". They should therefore have stopped the earlier car as well.
The two police Vauxhall Astras used in the final chase sequence are registered with "51" and "02" plates, indicating that they were registered between 1 September 2001 and 31 August 2002. The movie was shot (and presumably set) in 2007, and these cars would have then been five-six years old. UK Police cars are replaced at 3 years old due to the high mileage and heavy use they get in Service.
Towards the end, when Danny & Sgt. Angel are eating Cornetto's in the squad car and Angel states that he's gotten a "brain wave", Danny takes a bite of his Cornetto and immediately grimaces from what could only be explained as "brain freeze". When, in fact, "brain freeze" takes about 10-20 seconds to affect you.
When Nicholas is reading the newspaper in the pub on his first night in Sandford, the newspaper reports trouble with a proposed "Bipass" - this was confirmed as a deliberate typo in the audio commentary in which the director says it was done to annoy the typ of people that post on IMDb goofs pages, which it clearly did.
When Nick arrives in Sandford, the church tower clock shows the time as being 9.00pm (21:00), but the next shot of his mobile phone shows the time as 20:52. Given the fact that the church roof is in need of repair and everyone in the village is rather eccentric one way or another, it wouldn't be a surprise if the clock was a few minutes fast or possibly not even running.
After Messenger is killed, inside the church when the swan is suggested being the killer Andy says," Apparently they can break a man's arm." Like it is part of the story but there is no other mention of a swan breaking a mans arm at all throughout the movie, however, this was just Andy making a sarcastic comment on how Angel was chasing a Swan, it's also a common myth that a Swan can break a person's arm or leg.
Sargent Angel confronts the suspected shop lifter while he is still in the supermarket. At that stage, no actual crime had been committed. It is only when shop lifter passes the checkout and leave the store without paying for items that the crime is committed. Angel throws a can at the suspect, bringing him down with a blow to the head. This could be classed as unreasonable force by Angel. Even when using their baton, British Police officers are restricted as to where they should strike a suspect.
When gearing up in a final scene they show pump shotguns being cocked and a double barrel 12 gauge being closed with two shells loaded. Both shotgun shells in the double barrel shotgun clearly show the primers being already fired, probably being used for safety.
The goof items below may give away important plot points.
In the final scene where Frank's gun is pointed at Nicholas, Danny grabs it, but when changed to another angle, he grabs it again. This is similar to the scene where Nicholas is in the prison cell and turns around to look at Danny, but from another angle, he turns his head a second time.
The seats in Simon Skinner's light blue Jaguar XK convertible alternate between a pre-2000 model year and a post-2000 model year car - the difference being adjustable headrests. The headrests are adjustable when Skinner is present at the Blower-Draper "crash", but the seats are one-piece seats when Skinner drives past Angel after Merchant's death.
In the car chase at the end of the movie, Frank Butterman takes out the driver's side door to Danny's police car. In the following cuts, the exterior shots show the door missing, but the interior shots show the door still intact.
The position of the torch (flashlight) Sergeant Angel is holding after he briefly holds Danny hostage changes, from his left hand as we see the back view of him running through the arch to his right hand as we see the front view.
After PC Danny Butterman is shot by Tom Weaver and lands on the floor, Mr Weaver falls into the evidence room and sets off the mine. The Police station then gets blown up. But when Sgt. Angel finds Danny after the explosion rather than Danny being covered with debris he is lying on a pile of debris and not on the floor where he started.
When Danny stabs Angel, he had not yet learned about the murders committed by the NWA. Therefore he would have had no reason to falsify Angel's death for his protection, nor would he be likely to commit an apparent murder in front of (he thought) law-abiding witnesses.