Vicky comes in and leave the door partway open looking for stuff. But when she goes to leave, she has to reopen the door.
In the first couple of scenes (the coffee house and back at WandG's apartment), the right sleeve cuff of Grace's shirt changes from "messed up" (folded under) to straight and "fixed" quite often.
Debra Messing (Grace) not knowing she was on camera can be seen in the background clapping at Will's 'Yentl breakdown' joke.