Factual error: Although the movie was set in the 1940s, the railroad track had modern concrete ties.
Factual error: During the airport scene, the 737 shown is a model from 1984 or newer, with distinctive large diameter engines. The movie is set in 1976, when all 737s had long narrow engines.
Factual error: As the cars travel over 1950s Westminster bridge, the modern red route lines can be seen on the road.
Factual error: The bar shown in Iqualuit is not real. Iqualuit only has 6100 or so people, and there is no bar like the one shown in the movie. The building is wrong - it doesn't even look like any buildings in Iqualuit. There is one bar that looks nothing like the movie, one Legion, and a bar in the hotel in Iqualuit.
Factual error: When the college students are shooting pedestrians with paintball guns, the guns don't have ball hoppers which hold the paintball ammo, hence no ammo. Yet when the camera angle changes, it shows pedestrians getting hit by paintballs.
Factual error: During Ami's first attempt at revenge, when she kills the mother (who is overlooking her dead son's head), she stabs the mother in the back of the head, making the knife exit through her mouth. Yet, for no apparent reason, we see intestines fall out of the mother's mouth, which makes absolutely no sense. The intestines are in the lower abdomen, not in the head/neck area. More than likely done for a stylized purpose, but still a mistake.
Factual error: The movie is supposed to be set in Texico New Mexico, however there are mountains in the background. The closest mountains are near Albuquerque, NM while the area surrounding Texico is completely flat.
Factual error: When Emma and Richard decide to call off the wedding, to provide an excuse to evacuate the church they light a small fire to set off the sprinkler in the side room they are in, but the sprinklers also go off in the main area of the church, forcing all the guests to leave. Sprinklers are individually heat-activated, and one going off in response to a localized fire would not set off sprinklers in other areas.
Factual error: Chicago is the setting of the movie - the distance from Chicago to Georgetown is not as long as depicted.
Factual error: There is an ostrich that releases an egg on to his plate, however the bird is a male as females are brown and this one was not.
Factual error: We're told over and over that Vicky is an expert on Barcelona and Catalonia, for she has written a thesis. She visits Avilés (Asturias) with Juan Antonio, where he tells her he was born a few blocks from there; however, during their dinner at night the actress mistakes and tells him that he's from Catalonia, instead of Asturian. Anyone with a such an expertise on Catalonia will know that. Besides, it's not real life, but a screenplay, so either Woody Allen screwed up, or the actress did.