I quite agree about the camera shot where John said they got it wrong and their reaction. That was possibly the highlight of the show for me.
In face, the production was brilliant. No unfortunate angles, nothing. Most definitely a show meant to feature the magic respectfully, I feel.
I can't figure out John's method. I just know that both times I've see him do it (once on Fool Us and once when he opened for Tim Vine in Manchester) it was in a different envelope... so it's not an obvious method.
Love it, really. Shame about the sales pitch blowing it though.