When sitting around the table with her friends, the book Katie is holding changes between shots.
Katie is studying in the library. She is writing with a pencil, and starts to nod off. She falls asleep for a second, and we see and hear her pencil drop onto her notebook, but in the next shot she is holding her pencil upright.
Katie's hair changes colors repeatedly throughout the film, from light brown to almost black and back again.
When Katie is first shown typing her thesis in the library, the speed of her typing does not match the speed of words appearing on the computer screen.
After the cop talks to Katie and he drops her off, she has a conversation with Harrison and her hair repeatedly jumps about between shots.
In the choir scene, Embry calls for just the sopranos to sing. Katie and the other girls are however singing alto.
When Katie goes to the job fair at the start of the film, one of the men throws her a ball. We hear the ball bounce before it even hits the floor.
At the AA meeting, Detective Handler says, "I'm Wade Handler; I'm a cop." Last names are not given at AA meetings, to preserve the anonymity of those present.
When Katie asks Embrey where he's been he states, "l went traveling--lndia... Asia." Someone as brilliant and well-educated as Embry would have known India is on the Asian continent, and therefore what he is telling her doesn't make sense: India and Asia are the same place, the name of the country on the continent that it resides.