A more simple tactic, but one potentially used with a trusting enough group, is the misrepresentation (or bad calling) of a hand.

This is the act of a cheat revealing his or her hand at showdown, and calling it something better than it is; for example, throwing down an all-red Straight and calling it a Straight Flush. If nobody notices the cheat's 'mistake', then the cheat could very well win the entire pot on a lie. If somebody notices the cheat's 'mistake', then the cheat claims that it is just that...a mistake.