Revealing mistake: In Frank and Sarah's first conversation her headset is on mute, shown by the fact it's blinking red. (00:02:25)
Revealing mistake: Alexander Dunning tells Agent Cooper to handcuff Frank. After Cooper handcuffs Frank it then cuts to a close-up of Frank's hand, showing Cooper giving him the key to the handcuffs. In this shot, we can see that the cuffs aren't actually locked in. He obviously is supposed to have locked the cuffs since he gave Frank a key to unlock them - if he faked it, why the key? This is most noticeable when Frank clenches and lowers his hand after being given the key, giving away the loose cuff. (01:41:25)
Chosen answer: The check he got and keeps tearing up. The first time he didn't get it was probably a legitimate error and he did not get the check, so called her company to get a new one, and then fell in love with her voice so continued to destroy the checks to keep talking to her.
Quantom X ★