When Will comes over for hamburgers, Allie's mother starts quoting poetry. She explains it's a poem about how Arthur became the leader Britain needed. The lines come from an actual poem, "The Lady of Shalott", by Alfred, Lord Tennyson. The person being described in the poem is Sir Launcelot. King Arthur is not mentioned at all.
Brittany is constantly jogging throughout the film, and doing long distance runs to train for track. However, she runs the 400m, a sprint, and therefore should be encompassing far more sprinting and speed work than distance training.
The football field end zone is only 5 yards deep. American football field end zones are 10 yards deep. In addition, the curved goal post support is placed on the rear end zone line. It should be a few yards behind the back line (for safety reasons).