1. These are both in the same scene, so you don't have to look all over the movie for them.

Slip-up 1. When Clark asks eddy if anyone has ever told him if he was bad luck, Eddy is holding a green colored drink. When they turn around, eddy is holding a blue colored drink.

Slip-up 2. When they see Clark's Wife talking to Wayne Newton, they have Bloody Mary's (Wayne & Ellen) When Clark and Eddy approach them, Wayne's Drink suddenly changes to a Gin-And-Tonic