Factual error: The whole Bowfinger scenario is impossible. They are using a 35mm Panavision cine camera which cannot be focused through the lens; it needs precise measurements on the set in order to be properly in register. Then there are the light readings required to ensure proper exposure. Wouldn't Kit Ramsay notice the man with the light meter, or the one with the tape recorder? Both measurements would have to be done with him or an identically dressed and made up stand-in (a "lighting double") on the spot. Then there is the sound. Any sound recordist worth his salary will have the microphone within centimetres of his subject, and he'll have a boom operator keeping in there. We don't even see a microphone in use! Please don't tell me this is based on the clandestine filming of Mary Pickford during her Russian visit: that was done with old black and white film which has very wide tolerance to exposure and most of all it was silent, and she was aware of the camera crew, she just thought they were news crews. (And the results were rubbish anyway).
Factual error: Laredo drives the ship out of the starship docking station and scrapes the main hull on the walls. This would not be possible without either scraping the wings first, as they are much wider than the main ship, or turning nearly sideways, which they clearly don't.
Factual error: Right after Lance gets hurt and Mox replaces him Mox's first play is a 40 yard pass for a first down after which everyone starts yelling he needs to stop the clock and the camera shows the clock moving. The problem is that in high school football the clock stops on first downs while they reset the chains so the clock should have stopped running until the first down markers were moved and the ref set the ball.
Factual error: During the press conference, the president says that at 5:00 AM the Baldwin residence was bombed. However, the Baldwins were sunning themselves. And, if the president was referring to Eastern time, it would have been 2:00 AM in Hollywood (sign in the background). (00:26:35 - 00:27:45)
Factual error: When they show the capital building in Washington DC it is still under construction, but it was actually finished in 1864 - 5 years before the movie's set.
Factual error: If the access hatch to the nose wheel well on an airliner was opened at any time during the take off run every alarm panel in the cockpit would light up like a Christmas tree. The pilot would immediately abort take off.
Factual error: In one scene supposedly set in the late '70s (Andy was about to get/just got "Taxi"), Andy is playing Ms. Pac Man. I may be wrong here, but didn't Ms. Pac-Man come out in 1982 or 1983? (00:29:30)
Factual error: In the scene where the fire department responds to the fire, the engine is 42. Yet all the fireman's hats say 6. The engine company, station etc. would all be the same number so their helmets should have also been 42.
Factual error: As Ray is fighting the big inmate over the cornbread, Ray falls over, revealing a yellow patch on the bottom of his boot. That patch is the trademark of a Vibram sole. Vibram started using the yellow patch in 1965. The scene takes place in the 1930s.
Factual error: When the police arrive at the Little house to take the "missing person" report, their car has a blue light on top. Police in New York display red lights.
Factual error: This film takes place on New Year's eve in the year 1981, yet between a couple of scenes, it shows the streets of New York filled with modern-day cars and taxis.
Factual error: In the end credits, the year is given as MCMXCVIX. This is not a correct Roman numeral. It should be MCMXCIX.
Factual error: When Ben and Sarah are on top of the train, they shout and it echoes, but there are no flat surfaces for their voices to reverberate off of.