Revealing mistake: At the start of digging the tunnel, one of the characters (I think Denny) calls Woody Allen, "Woody" by accident.
Revealing mistake: A policeman fires during the robbery even though the slide on his automatic is visibly locked back and open.
Continuity mistake: When we see the police officer checking the hit counter on an adult web site, the hit counter goes down from 1,739,986 to 1,739,944 a few seconds later.
Plot hole: Towards the end of the movie when Michael Douglas makes his speech at the White House, he is able to quietly walk out of the gates with no reporters anywhere trying to chase him down. Totally unrealistic (especially considering what had just happened). (00:03:03 - 02:13:40)
Deliberate mistake: You might be wondering where Terry suddenly comes up with Jolly Jack all of the sudden after escaping the lab. In the commentary, they say that the Joker, in his transmission to Terry in the lab, was supposed to be eating out of a candy jar with "Jolly Jack" on it, but couldn't have it due to time constraints.
Continuity mistake: Luke McNamara is handcuffed behind his back at the police station but as he is loaded in to the ambulance he mysteriously is cuffed in front. [The handcuffs inside are normal police issue handcuffs and outside as he's getting into the ambulance they're attached to a belt, normally used for criminals they consider dangerous.]
Revealing mistake: When Jean Reno and Vincent Cassel approach the hanging body of Jean-Pierre Cassel in the doctor's house, the hooded killer can be seen standing to the left of the screen. [Not visible on the VHS version, but on the widescreen DVD].
Continuity mistake: When Ray gives his girlfriend the present right at the start, her bag moves up her arm when the shot changes. (00:01:10)
Factual error: This movie is supposed to be set in the 80's as it says in the beginning of the movie, however, during many shots where the street is visible from the news broadcast center or the scene with John Travolta in the street, there are many cars which were not around. One of these cars, for example is a 2000 Dodge Intrepid.
Other mistake: The girls paint their van with brushes before heading off. When the van is being driven later in the film as they make their getaway, it's obviously been airbrushed, as it's too smooth a paint job.
Continuity mistake: Harry stands on top of a building with a girl folding paper planes. The plane they fold is folded with a blunt front. He throws it off the building and then the plane flies, all of a sudden the nose is sharp, this is visible. (00:12:10)
Visible crew/equipment: When the car is sitting in the back of the trailer there is a cable visible connected to the front of the car. In the next scene the cable is gone.
Continuity mistake: In the gas station scene after Ellen learns that Phil has drowned, she is so distraught she forgets to put the gas cap on and we can see it on the roof of her car as she drives away. But when she arrives at the police station we can see that the gas cap is on. (01:10:20)
Revealing mistake: In the first morgue scene the body on the table is obviously breathing.
Continuity mistake: When Gene Hackman is helping his wife zip up her dress her hair goes from hanging straight down her back, to being over her shoulder. It cuts without giving enough time to assume that she moved her hair.
Continuity mistake: After the doctor stitches and dresses his own eye, blood disappears, reappears and gets bigger and smaller through the dressing.
Continuity mistake: After his conversation with Leo, Willie presses the dial/talk button on his cordless phone and the light remains on. (00:59:40)
Visible crew/equipment: During the scene where Chopper shoots Sammy the Turk in the eye with the shotgun in the car park behind Bojangles, the pregnant woman runs back to the car after witnessing the shooting, you can see the boom mike in the bottom right of the car's windscreen.
Factual error: The actress Sasha Barrese is credited at the beginning of the movie as "Sasha Berrese".
Factual error: Alex's 6-year-old kid must be a very powerful little boy: when he grabs that model aeroplane glue tube it bursts in the air like water.