In a scene where the main character, Peter is playing in the finals of Wimbledon, the camera closes up on his face, and you can see his neck and part of his shirt as well. My friend and I noticed that in one shot the tag on the collar of his shirt says "M" indicating medium. The camera then turns to the opponent, and when it comes back to Peter you can still see the shirt tag, but this time it says "L" indicating large. The scene was obviously shot on two different occasions, but why did the actor change shirt sizes?