Factual error: In the streetcar scene a passenger is a soldier wearing a US Army green uniform with a CIB, Comat Infantry Badge. At the time US uniforms were brown and there is no plausible reason for this US soldier to be in that country.
Factual error: Late in the big chase scene, Sol climbs on top of the Bentley just as Sinclair decides to drive it straight through a bus that is blocking the highway. Somehow, the Bentley levitates from the highway to about 4 or 5 feet in the air, penetrating the bus passenger cabin rather than impacting the chassis of the bus. Also, as the bus inexplicably explodes in a fireball, Sol (who was atop the car) is torn to pieces, with his decapitated head hurtling straight into the camera. Without lungs or diaphragm, Sol's head is still audibly screaming.
Factual error: During the opening credits. An LCD screen is shown with lat/long coordinates. The movie takes place in the Persian Gulf. The coordinates are in the vicinity of Oceanside, CA.
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.
Factual error: The "corn" they are growing is not corn, just crabgrass.
Factual error: When Ami and Miki are driving nails into the henchman's face to make him talk, it is very clear that the depth of the nails would have killed him, as they would have penetrated deep into his brain. Obviously done for stylistic effect, but a mistake nonetheless.
Factual error: Chicago is the setting of the movie - the distance from Chicago to Georgetown is not as long as depicted.
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.