In the final match, the scoreboard doesn't always correspond to the film's timeline.
The net on the Centre Court for a singles game is never the doubles net used in the movie.
In the final match, the scoreboard show first set 2-6 (about 4 sec at 1:23:34). Correct is 1-6.
Centre Court is too green and intact. After two weeks of play, the surface should be worn out, and mostly light brown or yellow, not green.
When Björn Borg enters a bar/café to hide from fans and use the phone, a bottle of Hendrick's Gin is on the shelf behind the waiter. Hendrick's Gin was launched in 1999.
Early in the movie, Borg arrives at a hotel in a car prior to Wimbeldon. He arrives to find paparazzi and a mob of fans waiting for him. The photographer has a Canon T-90 camera, released in 1986.
In the final match, the manufacturers' logos are missing from both players' shirts Sergio Tacchini in McEnroe's case and Fila for Borg.