Continuity mistake: When Lindsey is at her parent's house during spring break, they are discussing her father's hair. In the shot when her mother opens the fridge there are only 5 cookies on the plate, but when the shot changes and Lindsey is grabbing some cookies there is a whole plate of them. And the honey pot is missing too.
Other mistake: Near the end when Lindsey goes to Fenway to stop Ben from selling his tickets, she borrows binoculars from someone to find him across the field. She's looking through the wrong end. The way she's holding them, everything would look tiny, and yet she still sees him.