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.
When Will and Jack are first in the gym together, they are positioned near a woman working out on a chest press machine. She exercises on the machine without pausing or resting for the entire scene--at least 2.5 minutes.