During Tessa's debate with Hardin about "Pride and Prejudice", one of Hardin's many tattoos shown is one in Hebrew on his right upper arm. The letters of these two words are written backwards on his arm (left to right), thus the words don't make any sense that way. They're supposed to be written from right to left, and they mean: "We are all stupid".
When moving into her dorm, Tessa tells her roommate that it's "always been just us two [her and her mom]", but later tells Hardin that her dad left the family when she was ten.
Hardin and Tessa go to an aquarium that has a whale shark. The only aquarium outside of Asia that has whale sharks is in Georgia, where the movie was filmed, but the story takes place in Washington state.