Continuity mistake: When Elliot's the basketball player, when he scores the slam-dunk and breaks the headboard, he breaks the headboard after the slam as he bounces/hangs off the headboard. But in the replay he breaks the headboard as he makes the slam and then bounces/hangs off the headboard.
Factual error: When Elliot is the sensitive guy he picks up the guitar to sing a song to Allison. The guitar has a capo on it. During the song Elliot is changing cords and finger placement. He makes a cord above the capo. This would not be possible since the capo effectively cuts off the strings at the point of the capo. Any finger movement above the capo would not change the chord at all.
Continuity mistake: At the very start of the film when Elliot is holding the door open for the people and they start to rush in at a very high speed, if you look closely about halfway through you will see the same people going in like in the first half of it (Especially look for a woman in a light blue suit). The clip is just being replayed.
Continuity mistake: Elliot is given a contract in the Devil's office. In one shot the contract is hanging off of the edge of the table. But a couple shots later, when the Devil picks up an apple and walks by the table, the contract is further onto the table, in a different position.
Revealing mistake: During the opening sequence we see a lot of things happening very quickly and sped up. Everything is going in a progressive direction, not going backwards. As the sun rises in San Francisco a clock on a building is shown. The hands on the clock are going backwards instead of forwards. This was shot at dusk, not dawn, then reversed.
Continuity mistake: When Elliot and The Devil (Liz Hurley) are in Alison's bedroom, Liz tells Elliot that Alison is in the shower. Elliot goes to take a look, but notice the bed in the middle of the room. We see a shot of him and the bed, a shot of Liz then a shot of Elliot walking to the bathroom. So, in reality, Elliot walked through the bed to get to the bathroom, but it is back in the next shot.
Other mistake: When Elliot the genius homosexual and Allison arrive at his apartment he hangs her wrap on the arm of the statue. He then begins to take off his overcoat and hangs it on the other arm. There is a cut to another angle and the coat is already hung on the arm and he is sliding out of it. There was not enough time for this transition to happen.
Continuity mistake: When Elliot is in the Devil's office, the Devil goes over to a side cabinet, and picks up an apple. Next to the apples is a vase of roses. The position of the roses changes from when the Devil goes to pick up the apple, to the next shot, when she walks over to Elliot.
Continuity mistake: When Elliot is the Colombian drug dealer and is having an argument with his wife, she throws a glass of some liquid at him but it hits the door and the liquid splashes across the door. She then throws something else at him which also hits the door, but the door is now completely dry.
Continuity mistake: The Devil gives Elliot a pager and she tells him that if he wants to get out of his wish he should dial "666". In some wishes he presses the "6" three times and is transported out, in others he presses the "6" three times and then presses another button and is transported out and in the sensitive guy wish he presses the "6" four times.