When Jennifer gets home after her dancing night out with Ryan, the burnt cookies that Amy made for Jennifer at least half an hour earlier are still smoking.
When Amy runs up to Jennifer in the street to talk to her (after she's kissed her), her jacket is alternately on/off her shoulder between shots.
When Jennifer meets Ryan after her graduation, the Golden Gate is in the mist. As he walks away, there is sunny weather.
When Hunter meets Jennifer in the library for the first time, Jennifer has a black headband and three barrettes in her hair (maroon, red, then blue). Once she steps outside with Ryan, the headband is gone and the barrettes are in a new order and without the blue one (red, red, then maroon).
While Jen and Amy are on the bed after Amy talks about the library desks, Jen's hair on her left ear goes from having a stray piece overlap her ear and being completely behind her ear between shots.
Berkeley does not offer degrees in Latin or Structural Engineering (although Classics and Civil Engineering are options).
After Amy has burnt she tells Jennifer she burnt two batches of cookies the timer dings signaling the third batch is done but neither makes a move to take that batch out of the oven.
Ryan's favorite place to go and think is on the Marin side of the Golden Gate Bridge. It is nowhere near the Berkeley Campus and cannot be reasonably walked to from there.
When driving from Berkeley to the airport, they cross the Golden Gate Bridge. The bridge is in the opposite direction from all Bay Area airports.
Ryan's high school girlfriend is supposedly going to school in Seattle, Washington, but she has the school logo of the college in Pullman, Washington (over 200 miles away) on her dorm room door.
What is suppose to be Telegraph Ave. is not the real Telegraph Ave. at all.
There is no way that Jennifer and Amy, as college students, would be able to afford such an apartment in the Bay Area (especially in San Francisco, which is an illogical place to live for Berkeley students anyway).