On Chesil Beach

Executive Producer, Author, and Screenwriter Ian McEwan stated to an audience back in 2014 that he wanted Saoirse Ronan to play Florence Ponting.

In the tennis match between Edward and Florence's father (Geoffrey), they're either counting the games wrong or not alternating service properly. Edward begins serving at the start of the third set, so he should be serving when the game score is even. We immediately jump forward to a later game in which Geoffrey is serving. Geoffrey loses the game (for a change), and Edward announces the score as 1-4 before serving, which means he is now serving when the game score is odd.

It's also slightly off that Geoffrey starts serving the first set, and then Geoffrey begins serving the third set after 12 games. This, however, could simply be the result of Geoffrey letting Edward begin serving the third set, out-of-order and out of strict compliance with the rules, as a sop after beating him 6-0, 6-0 in the first two sets.