Continuity mistake: In the beginning of the film, when Pitka is using the voice-over machine, it is a black machine. In the bar scene however, the machine is a pale-ish orange color. The orange-ish machine is also used in the ending scene before the song.
Other mistake: When Downtown is in the manager's office receiving his punishment (being benched), as he leaves he slams the door on the cinderblock wall. If you look closely, you can see the cinderblock wall sway. (00:26:34)
Continuity mistake: Just before Burt gets ready for his record-setting attempt, he wraps some asbestos cloth around his leg to protect it from the hot exhaust pipe. This does not allow him to fit his leg within the cowling of the bike, so he throws it off and puts his leg in without the protective covering. As he inserts his leg into the cowling, you can see that his pants leg is bunched up around his calf, not tucked into the top of his sock, as is Burt's usual procedure. However, a close up of the leg only a few moments later shows the pants leg tucked into the sock, and he could never have done that once he was fully seated in the cowling.
Continuity mistake: When Derek arrives at the house party he gets a blue drink off a tray, yet when he manages to get away from the jocks its disappeared.
Continuity mistake: At the final fighting scene (David Sloan vs.Tong Po), you can see that Tong Po's hair (a half shaved head with only a ponytail on it) is as fake as it can be: everytime when he moves his head a bit to rough around (sweeping his ponytail around while fighting) clearly shows that he's wearing a special kind of wig attached to his head. That 'wig' is so badly attached that it looks like he's got rimples on the back and on top of his head.
Other mistake: In the Super Bowl, both end zones are painted with the Vikings logo (you can see the far end zone as they go to kick the game winning field goal). One end zone should bear the Bills' logo.
Continuity mistake: At the beginning of their first pool match, Fats' collar goes from buttoned to loose, to back buttoned in only a moment on-screen.
Continuity mistake: In the match between Loudon Swain and Chute the ref awards Chute 2 points for a take down, while in a referee's position, but in a real wrestling match you do not get 2 points for being on top in a referee's position.
Factual error: When the upset boyfriend ends up driving off the cliff, his car explodes into flames magically and the fire doesn't even start at the engine. The entire interior of the car is consumed and when the car crashes, its explosion is on par with a missile. The character, when seen next, doesn't have a burn on him at all ignoring the fact that there was no humanely possible way to survive that fall and explosion.
Factual error: Under the rules of Major League Baseball, a team owner cannot also serve as the team's manager; it constitutes a conflict of interest.
Factual error: The stadium in the opening scene was not around in 1995. The first game played in that stadium was 2001.
Continuity mistake: When John is at the pizza place after jogging, the sweat stain at the top of his shirt continuously changes.
Continuity mistake: In the scene showing Groucho being chased across the cars as they enter the race course, in the shot from behind you see him running along the rail only to slip, the following shot is from the front and shows the same slip he's already made.
Factual error: All UK driving test instructors must wear a yellow reflective waistcoat or jacket while instructing someone during their driving test. This was still true in 2002 when the film was shot.
Revealing mistake: During the night surfing scene notice that the sun is evident in the background (look closely it does not appear long). There are also shots where you can see clouds and faint blue sky. Moments later you see Keanu and Lori sitting in the water with completely different lighting which was actually taken at night and further distinguishes that the surfing shots were not actually done at night time. I heard the scene was shot during the day with a filter so it looked like it was shot at night.
Continuity mistake: In the locker room scene, Remer and Joe are both naked. When Remer goes to pull Squeak out the drawer, you see him put a robe on, but you also see him wearing underwear. It wouldn't be possible to put on underwear in about 1/2 a second.
Factual error: When asked how many seas the water from the Triton light is from, Huard says eight and is corrected with an answer of seven. The real number is 22.
Continuity mistake: When the Tigers are coming to bat in the third inning, the announcer says that they have 2 hits so far, but the scoreboard at Yankee stadium just showed them as having 0.
Revealing mistake: During the film, the Nike tick on the Arsenal shirt is a reversed tick, revealing a flipped shot.
Revealing mistake: When Walther Matthau is making sandwiches for his poker pals (during the movie's first poker game), Matthau drops a slice of bread on the kitchen floor. If you look at his hand, you'll see that he flicks his thumb to make the slice of bread fall.