When Rachel and Ross mix-up their bags after shopping, Ross mistakenly wears Rachel's shirt, thinking it is one that she picked out for him. However, it fits him perfectly and is obviously not in Rachel's size.
After Rachel says she buys 30 fashion magazines, her gesture changes and it appears that she says something that does not match the next shot.
During the flashback to Joey's date the night before, the stage is visible to the left of the screen.