The Other Marty: Joe Dirt's parents were originally played by Roseanne Barr and Gary Busey, but the director felt Roseanne's star power, in particular, was too distracting. So their scenes were reshot with Caroline Aaron and Fred Ward.
Playing Against Type: David Spade playing the nice guy, for once. Prior to this role he was known mainly for playing smug, sarcastic male secretary types.
Type Casting: Averted; most of David Spade's characters are snarky male secretary types. In this film, he plays a loveable idiot.