At the end of the movie at the Beta party, Eric, Cooz and Bobby and their girls jump into the pool three times. You can tell by Denise's distinct colored shirt
The pig which should be oiled, isn't oiled
When Cooze enters Eric's bedroom (as Eric is performing the Heimlich maneuver on Margie), it shows he is dropping the box he is holding, but as it cuts back to him leaning up against the door the box is still in his hands before he drops it.
In the first of the Greek Olympia events the women remove their tops and are standing only in their bras, but the next long shot shows them with their tops still on.
When Erik and his new girlfriend are outside on a date, at around 40 mins, when they kiss, she has a glass of wine in her left hand. When it switches camera views and they start kissing more she doesn't have the glass in her hand, and hasn't put it down.
When Edgar walks in to the Geek House kitchen and walks over to the refrigerator, movement from crew off camera can be seen reflected in the oven door.
The first letter in GEEK house is the Roman letter 'G' when it should have been the Greek letter 'Gamma'. However, this letter looks nothing like 'G' and using it would confuse everybody but the geeks.