House: editing craziness

I watched House Tuesday. The 'sode where House and Stacy are stuck at the airport. They both sit down at one of the rows of chairs. House is being House. Stacy is on the computer (I think). He's trying to figure out why she isn't wearing her cross, and Stacy is just ignoring him. In one shot she has a pen in her mouth, but switch to another and its tucked behind her ears. Then it’s gone completely. Next it appears tucked in her ears again. Then not. It was craziness!