The Mexican Turnover works if you can make it look normal to turn over a card with another card, and if not, it looks suspicious. But it is actually deceptive--people who aren't fooled don't see it, they deduce it.
The Flushtration Count works too, if it's not overdone. In effect, it's the same as the double flash used by monte throwers, and we know that works.
The Top Change
is visible on video, because you're watching the magician's hands, but it's invisible in practice, because the audience is misdirected, and the moves are natural.
You can actually win bets with the top change, and people who are betting aren't being polite, any more than the victims of the Three Card Monte are.