Continuity mistake: Leo brings Grace a cookie bouquet to her workplace, and sets it down on her desk. In following shots, the position of the cookies changes a couple of times, most noticeably as Karen comes out from hiding behind the screen.
Continuity mistake: Karen is pretending to be a maid in her own hotel suite, and she has a big cleaning cart, which has buckets full of items and objects which lay all over the table. As Karen talks with Grace the positions of these items change at various times.
Continuity mistake: When Will is standing cleaning a tray, on the counter behind him there is a large circular wooden board, with a white tea-towel sitting on it. After he cleans the tray and walks off, the white tea-towel has moved off the wooden board, and is on the edge of the counter. (00:09:55)
Continuity mistake: When Karen is lying on the table, her jacket is unbuttoned. And when Jack pushes her off the table and she gets back up, it's still unbuttoned. But as the shot cuts to her heading quickly over to the door, her jacket is now buttoned, but there was no time for her to do it.