For Buffalo Instant Hit, the game comes preloaded with a wheel bonus in the fifth reel, but that’s it. It’s a low-edge game anyway, so if I didn’t see two wheel bonuses in the fourth column, I wouldn’t bother with it.
I know of one guy, Jay Fructose, who has an app where it sounds like you can scan certain screens, and the app will tell you if it’s profitable (according to him). I’d guess that’s what these guys were doing. However, I can’t think of a better (worse?) way to stand out in a casino.