When at the home of Becky Leeman, her father Lester is showing the film crew his wine holding globe when he states that a tape deck comes out of Afghanistan while he is pointing below the equator. Afghanistan is found far above the equator.
In the beginning of the pageant you can see Lisa Swenson wearing a hat with "Lady Liberty", but when Amber Atkins starts talking to the crowd, you can see Lisa in the background wearing no hat anymore.
When Becky visits Mary at the hospital, Amber is combing her hair and a chunk falls out. Amber places the chunk back on Mary's crown. When Becky enters, Mary is suddenly wearing a tiara and the chunk of hair is hanging in front of her nightgown. There wouldn't have been time for Amber to have picked up the tiara from the dresser and fixed her hair.
Before performing the physical fitness routine, the girls say their step ladders are still wet with paint, but when the Vaseline is brought around to them, their hands are clean. Later, when they are on the stage, their hands are covered in paint.
The goof item below may give away important plot points.
When Rebecca walks on stage for the Mount Rose pageant winners announcement, she has nothing in her hands. While the runners up are being announced, she suddenly is holding a small gold trophy (there is no explanation as to what this trophy is). When Gladys announces Rebecca is the winner and she steps forward to be crowned, the small trophy has vanished, without there being time for her to put it down.