Factual error: When Frank knocks out the Umpire and begins to change into his clothes, the umpire is wearing white underwear. All umpires wear black in case the seat of their pants rip so the game can continue.
Factual error: In the opening game of the movie the announcers at the ball park are referring to the visiting team as the Peninsula White Sox. The team shown on the field is the Hagerstown Suns. (00:07:00)
Factual error: During Gavin Grey's first NFL game in 1957, the helmets depicted for both the Washington Redskins and Pittsburgh Steelers are historically inaccurate. The Redskins did not employ the burgundy helmets with the feather-stripe running along the center until 1958, and the Steelers didn't use black helmets with the Steelmark logo until 1963. In 1957, the Redskins used solid gold helmets while the Steelers used yellow helmets with a black stripe along the center and black numerals on either side.
Factual error: The F-16 in the movie is wearing a desert camouflage, this is the standard camouflage of the Israel's air force F-16 while the USAF F-16 have two tonalities of grey.
Factual error: The pizza parlor's big break comes when the Fireside Gourmet features them on his TV show. Leaving aside the unbelievability of a gourmet restaurant critic visiting a pizza parlor, he appears as himself on his TV shows. Food critics always dine anonymously so that the restaurant can't give them any special treatment. (Movies love to mess this up.) In addition, when they watch his review, he's barely spat out the name of the restaurant when the phone already starts ringing. Barely enough time to dial the phone, let alone look the restaurant up in Information as most would have needed to do for this little-known place.
Factual error: Near the end when MacPhearson tries to hide away from Dave Ryder in a large room, two men are running up a stairway one behind the other. MacPhearson shoots the one in front, which unrealistically, causes no reaction in the other man, who is directly running behind him, so MacPhearson can shoot him easily too.
Factual error: Slater had close to a dozen sticks of dynamite on him. At the very least they should have knocked Winona Ryder down, and made her deaf for a few days.
Factual error: At the end of the movie Tess gets a job at Trask. Her secretary tells her that she can get her schedule on the PC by pressing shift + s. That would result in a capital S only - what she probably means is ctrl + s. (01:44:15)
Factual error: The closing credits give thanks to "FAO Schwartz", misspelling the name of the famous toy store with an extra "T".
Factual error: In cooking class, the teacher said "two stalks of celery" and Michael handed Lorna one stalk, which she started to separate. One "stalk" is actually the entire bunch (or head), which is made up of 8-10+ "ribs" connected at the bottom. Two ribs will equal about one chopped cup - about right for the tuna walnut casserole made with one can of tuna. Americans typically use the word "stalk" interchangeably with "rib", calling a single rib/ stick/ branch a stalk, but the stalk is the entire bunch. (00:37:02)