When Peter is headed into his first game of Wimbledon, he says," So this is it. This is the end. This is what it looks like. 1000 balls a day, 300 days a year, for 25 years. 6,000,000 balls. And it all ends here. At 2 in the afternoon, on Court 17, while they're on center court, rooting for the latest Russian teenage beauty." 1000 balls/day x 300 days/year x 25 years is 7,500,000 balls, not six million.
In Colt's second round match against Dragomir, his voiceover claims that he only won 3 games, however the umpire clearly states that Dragomir leads 3 games to 2 and by 2 sets to 1. This means that Colt had to have won at least 8 games by this point.
When Lizzie spots the tennis courts that Peter learned on, and runs down the stairs, the sun is getting close to setting, but it is clearly still light out. By the time that Lizzie gets to the bottom of the stairs, it is pitch black in the sky.
After Peter slides on the wet grass in the championship game and turns onto his back, his shirt is barely dirty. When he sits up and is being called off the court by Danny, his shirt is completely muddy on one side.
When Peter Colt and Lizzie start to kiss in the car after leaving the Slazenger party, the bus in the background is a long way behind, just seen above the rear of the car. When Peter's car swerves into the other lane and back the bus is suddenly a few metres behind and travelling at the same speed.
When Peter and Lizzie leave the party and get in Peter's car the tax disc is in the bottom left hand corner of the windscreen, as it is during the kiss and swerve. In the next scene the tax disc is suddenly halfway up the windscreen.
Early in the film, Peter throws a pillow at his brother which lands in his lap. In the very next shot, the pillow is nowhere to be seen as Peter's brother raises his hands and shrugs in reference to something their mother says.
When Peter and Lizzie start talking with Jake Hammond at the party at the London Eye, they are at the top of the rotation. Then Peter punches Jake and immediately after that they run out and hop into the car. However, a whole rotation of the Eye takes about 30 minutes, so there is no way they would have gone from the top of the Eye to the bottom that quickly.
After the party on the London Eye, which is in central London, Lizzie and Peter drive out of town and down to Brighton. We see a shot of their car driving along a road in London called the Westway. However, they are shown travelling east - back into town. They should be travelling West if they're leaving town and going to Brighton.
Throughout the movie television coverage of the championships is shown on various TVs. For some reason they always show America's NBC network's coverage of the games. No NBC channels are available in the UK. The BBC cover Wimbledon on British television.
When Peter Colt first arrives in London he is seen driving down the Mall, through Admiralty Arch and around Trafalgar Square towards The Strand. This is away from The Dorchester which is located on Park Lane. If Peter Colt was on The Mall he should have gone up the Mall, turned onto Buckingham Palace Gardens which would have led him into Park Lane. Or he could have gone round the back of Buckingham Palace using Grosvenor Place to get into Park Lane.
To travel from London to Brighton would involve a boring journey due south down the A23. The journey shown goes north across the Thames, then takes the Westway (A40/M40) heading west, presumably followed by the M25, A stretch of road that is possibly in Surrey, then the unclassified road between Eastbourne and Brighton that passes Beachy Head but heading towards Eastbourne. One can only assume Peter Colt is not in any hurry to get Lizzie back to his flat since this journey would probably take three times as long as driving directly.
When at Peter's parent's house, in Brighton, his father is in the garden listening to the radio. At one point the radio announcer says 'You're listening to BBC London 94.9'. It would be impossible to receive BBC London Radio in Brighton unless on a Digital Radio. The radio depicted in the scene is obviously an analogue device.
Mens and womens semifinals are not played at the same day
(unless there has been rain) and definitely not at the same time as shown in the movie where both the leads are shown playing in the semifinals in the same shot.
On the day of the final, we hear the BBC Radio 1 Breakfast Show DJ Chris Moyles announcing the match, however Moyles's show was Monday to Friday and the men's final is on Sunday. Similarly, the men's and women's semifinals are shown being played on adjacent outside courts, whereas in reality they would be played (a) on show courts and (b) on different days (normally Friday and Thursday respectively) unless there were sustained rain delays, which does not seem to have been the case.
Lizzie in her Dorchester Hotel suite yells "It's open!", urging Peter to go straight in. Dorchester Hotel doors cannot be left open - they, like most five star hotel room doors, slam shut automatically for security reasons.
The grass in center court during the final match is too green and lush. In reality, after two weeks of intense play the court should have few green spots and more sandy areas, like a sandbox (the grass is not treated during the championship).
When entering the court for the championship match, Hammond and Colt are both carrying "Head" tennis bags, indicating the type of racket they use. Hammond's racket is a Wilson - clearly labeled and stenciled.