this is really a great routine to show people. It has instant interest from people, as they have heard about it, but have probably never seen it. It is also easy to carry three cards in your wallet and do it anywhere, which I did for years.
These comments are not directed at anyone in particular....just some observations and things I picked up from the Professor. Now I'm not quoting the Professor directly, but here is what I have learned about the two issues brought up:
First, if the move is flashing, I would suspect a technical problem. If a false toss is even suspected (as Erdnase would say, "let alone detected"), then the focus is too much on the toss itself instead of the "mixing" of the cards. Vernon said the toss should almost go straight down to the table instead of what we usually see, which is tossing it off to the side.
Second, by not allowing the spectator to choose, not only is he not embarrassed, but he is never allowed to be correct. Even if this is done by the best tosser in the world, people will often guess, and then it appears as though they have outfoxed you. I have watched 3 card monte with my somewhat trained eye, and I often can't really keep track of the queen, even if there is no move. If there was no money at stake, I could guess one out of three (pretty good odds), with no consequence.
also, it is difficult to structure a solid presentation with the spectator's guesses adding variables. With Vernon's routine, its a demonstration, rather than a challenge. You get the effect of the con, and can build your presentation in a measured way.
Some may prefer to thumb their noses at the spectators and shout "gotcha!", but these are never popular performers. With Vernon's routine, you get the best of both worlds. You actually do "get em", but as Leipzig used to say, they feel they have been "fooled by a gentleman"
hope this is of interest