Go to the part of the movie where the new Skulls are having their first dinner party with the rest of them. When Caleb (Paul Walker) says to Lucas (Josh Jackson) "...Speaking of Love..." Lucas is holding a drink. You can visibly see that there are no tables near where he is standing and people are commuting all around him so there is no where to put the drink down,however when his "date" comes up to him and he asks her to dance you can see that he is no longer holding his drink.