During the casino heist near the beginning of the movie Kurt Russell is wearing a white Elvis suit, while Kevin Costner is wearing a black Elvis suit. This foreshadows the good vs. evil relationship that Michael Zane (Russell) and Murphy (Costner) will have later in the movie
When the black Elvis impersonator approaches Kevin Costner's character and tries to talk to him, he is behind, then suddenly next to, then suddenly in front of Costner.
When Murphy reaches into the bag right before the final shootout, a scorpion stings him. However, the scorpion exhibits some impossible behavior. First, the scorpion jumps on his hand, but scorpions can't jump. A scorpion probably wouldn't attack a moving object like that, anyway. Second, the scorpion stings the hand. However, it stings it by bending the tail under its body. This is impossible since scorpions don't sting like this. They sting up and over their body. They also sting what they have in their claws. They are designed to capture prey in their claws and then feel around it with the tail and steadily deliver the sting.
Hanson: You make me laugh, you know that? I can't imagine what goes through that sick fuckin' mind of yours. Sometimes I actually think you believe you're the King himself. You know that? And what is it with those sideburns anyway? I glued mine on for the job. For you, it's an actual lifestyle choice. It's fucking sad, man.