Continuity mistake: Frank's cigarette has burned down with about half an inch of ash. When Claire gets it, you can see the ash is gone. It was too quick for her to flick it.
Continuity mistake: When Frank orders Peter to take off his clothes and get into the bathtub, he starts to unbutton the shirt putting the hand on the stomach at the end of the shot, but in the next one he's still seen in the mirror's reflection with the hand on the collar side. (00:46:35)
Continuity mistake: When Frank proceeds to interact with the spider caught in a drinking glass, a number of items have disappeared: a) Dark towel hanging on the refrigerator door. B) Power cord going behind the refrigerator. C) Bottle on right side of middle window. In addition, the two bottles on the floor near the refrigerator were moved a little and were switched (pay attention to the yellow collar ring). (00:48:00 - 00:49:00)
Continuity mistake: When Frank and Gene Clancy are at Oren Chase's house, Oren ends the conversation by taking a sip of his ice tea. When he first grabs the glass, he grabs it by the top. In the next shot, he's holding it by the middle. And in the following shot, he's holding it at the top again.
