Continuity mistake: At the end of the film, Dave Kovic addresses Congress, just before he has his "second stroke." The camera often shows the congressman in their seats, as well as shots which show the balcony, where spectators and the press sit. If you watch closely you'll note that in some shots the balcony is jammed packed with people and in others it is completely empty. (01:31:20)
Continuity mistake: Duane and his Secret Service colleague wait for Dave at his home to ask him to double for the President. When Dave sees them as he comes out of the kitchen he has a bottle in his left hand. When the camera angle changes the bottle is gone but reappears in the next shot. (00:08:00)NancyFelix
Continuity mistake: In the last scene Dave is giving a speech to both houses of congress, yet he is speaking in the Senate chamber. There is not enough room in the Senate chamber to do a presentation to a joint session of congress. It is always done in the house chamber. [This scene was filmed in the State Capitol Building in one contributor's hometown of Richmond, Virginia. The set was actually the Chamber of the House of Delegates (the local version of the House of Representatives). The unfortunate thing is that it strongly resembles the United States Senate Chambers, so I can understand the confusion. BTW, the full/empty gallery scenes were a mistake. Most of the scene was shot during the day with plenty of extras on hand (including yours truly), but they had to do reshoots a few weeks later. The only problem was that the Legislature was in session, and the shots had to be done at night.] (01:30:15)
Other mistake: When the real First Lady and the fake President emerge from the secret passageway leading to the fountain, there is an extremely bad process shot of the White House, which jumps visibly. (01:06:10)
Continuity mistake: When Dave and the First Lady escape from the White House, you can see that she is holding a bag of groceries before they get to the grocery store. (01:07:00)
Factual error: At the beginning when Dave is imitating the president in the car dealership commercial, he's talking about the specials on the Geo Storm and Geo Storm convertibles. Geo never made a Storm convertible. The only convertible car sold under the Geo nameplate was a convertible version of the Geo Metro, based on the Suzuki Swift.