John Carney did a great job!
Unfortunately the camera angles were a bit telling for the loads, but his presentation was good enough the my wife didn't notice the flashes, and she gasped when the glass appeared. He played well off Dave too.
The only real flashes I saw was the load of the orange and when the one tip on the wand disappeared.
Since this show was aired a few nights ago, I would think the producer would be decent to the performers and edit these exposed angles out just by cutting to a different camera angle showing Dave and John instead of just John's hands.
Oh well. . . What can you do.