Right near the start of the Gunfight at OK Corral, Virgil holds out his hand and says "That's not what I want". At this point, one of the characters (can't remember who it is offhand - but I think it's the character played by Wyatt Earp III) high-tails it out of there by pushing through a gate, and just after he does that, you can hear the director call out "CUT". The time stamp of this slip-up on the DVD is 1:14:15