Continuity mistake: When Jennifer Lopez and Ben Affleck first share the bed together, the digital clock on Jennifer's right side (viewer's left) first goes from 10:27 to 10:28 in two consecutive shots. However, in two more following shots during the same scene, the clock displays 10:27 once again, and then displays 10:28 again before the scene ends.
Continuity mistake: When the cop comes to visit Gigli and Ricky at Gigli's apartment, he is seen with a coffee cup in his hand. In one shot he is holding it and then sets it down on a table. The next shot, he goes to pick it up. Then another shot and the coffee cup is no longer in his hand. It isn't on the table anymore either.