This Slip-up occurs during the scene that the Wicken chick and the dude with the sick girlfriend are talking at the table in the guide's house.

She says something to the effect 'you look really stressed out' and he slams his hands down on the table knocking over an empty coffee cup. The camera pans back to her for a reaction, then to him again... Here we see the coffee cup sitting upright again...

Whoops!