This occurs in the scene in which Erin first goes to the water utility. Watch the purse strap that's lying on the desk top. It moves from being next to her right arm -- to being about 6 inches away -- to being next to her right arm (she even bumps it slightly and its practically laying on her sunglasses) -- then its back to being 6 inches away -- and finally, its back next to her arm. Clearly, the scene was made in at least two takes which were then put together with cutting and pasting.