Continuity mistake: On the London Eye, Peter and Lizzie are looking at the Houses of Parliament from quite a height, so they've got around ten minutes before they're back on the ground (a "flight" takes around 30 mins). Jake walks up, Peter punches him, then immediately they run off in the hubbub afterwards, suddenly back at ground level.Jon Sandys
Continuity mistake: When Lizzie and Peter are talking in the sushi restaurant, Lizzie's hair moves positions between shots. In shots of her talking, her hair is in front of her shoulder. In shots of Peter talking, you can still see Lizzie and her hair is behind her shoulder.
Continuity mistake: When Peter is going up to Lizzie's room with the fish and chips, he has cut himself shaving. The piece of paper he has stuck to his face starts off on the corner of his lip and then jumps down and left.
Continuity mistake: when Peter stays behind to work on his serve, he has 5 ball tubes and 2 beer cans in his hand (which he is using for target practice). The number of tubes on the court and the position of them changes countless times while he is serving with Lizzie. (00:10:35 - 00:12:10)
Continuity mistake: When Lizzie's father comes looking for her, he walks up two flights of stairs to get to Peter's door. When Peter opens the door, you can see the number 4 on the door. (00:43:10 - 00:45:30)
Continuity mistake: When the exterior of Peter's flat is first seen, there is scaffolding outside the front door. The following morning when Lizzie's father comes looking for her, the shot on the TV of the exterior shows no scaffolding. (00:36:30 - 00:43:15)
Trivia: Scenes for the film were filmed during the Wimbledon tournament 2003. The actors would walk out on court at the beginning or end of a match as though they were really competing. The officials and spectators were actual tennis officials and spectators, rather than extras. It is the only time in the history of the tournament that this has been allowed.