Continuity mistake: About 35-40 minutes into the film, Jules and Jess are at the bus stop. Pinky's future in-laws drive by in the Jaguar with nothing in front of them. When the camera shot moves back as they enter the bend, another car has appeared in front of them.
Continuity mistake: In the scene of the football game in which Jess and Jules are not talking, if you watch closely, you can see that Jules' headband changes from a black fabric headband to a crisscross plastic headband.
Continuity mistake: At the football match when Jules and Jess are fighting, Jess dribbles the ball and passes it along the ground to Jules. In the next shot Jules heads the ball and scores the goal which would be impossible to achieve if the ball came to her from the ground.
Continuity mistake: In the scene at Jess' house after the wedding, her mom and two other ladies are sitting on the couch with their feet up. In the first shot of the feet, there are two coffee cups visible, one with roses or some other flower(left) and one checkered blue with flowers (right). In the very next shot there are three coffee mugs on the table, the extra one in between the first two and coming from nowhere as the woman on the right was obviously not holding one. (Even if it was in her left hand and unseen, her arm was up and the checkered mug was closer to her.). (01:35:30)