Here's another performance, and it's way easier to see the techniques in this one. The initials move around the card in comparison to the line quite noticeably. He should tell his camera operator not to zoom in on the cards so closely, and rely on confirmations from the audience volunteers. Or have the assistant under the table copy the signatures better.
https://youtube.com/v/IZAc_aW6xcw
by lukeburrage, in response to this post 2015-07-30 16:56:46