On the pier, when Rosemary Sidney forces Hal to dance with her, the flowery white earrings she's been wearing suddenly disappear. In the next shot, when she presses her head against Hal's cheek, Rosemary's earrings just as suddenly reappear, one of which scratches his face. She then apologizes and removes both earrings.
Toward the end of the film when Hal hops a freight train to Tulsa, he jumps onto a boxcar that has its door shut. He climbs the ladder and stands on top to wave to Madge. In this long shot the boxcar door is now open.
When Neewollah Queen Madge goes to return the royal robe, she's still wearing the sash as she stands on the footbridge and watches Hal and Millie dancing. When she joins the group seconds later, in that famous clapping scene, the sash is gone.
It is implied that the train seen when Kim Novak is on the bus to Tulsa is the same one that William Holden boarded. The train he boarded was pulled by a diesel locomotive. The train seen in the same frame with the bus is being pulled by a steam locomotive.
In the beginning when Mr. Benson is leaving the house he is w/ the guys on the lawn and trying to button his jacket, but it swings open. Then when he's alone in the next shot, the jacket is fully buttoned.
Millie is reading Carson McCullers' "The Ballad of the Sad Cafe," a very thick book she carries around during the early scenes of the movie. In reality, that literary work is a very slim novella that is considerably less than 100 pages long
This is not really a goof. At the time of the film (1955) in the fictitious town of Salinson (a mix of the city names of Salina and Hutchinson, both filming locales), both the Salina Journal and the Hutchinson News were afternoon papers, producing a first edition shortly after noon and a home delivery edition after 3 pm. The Salina Journal did not become a morning paper until the 1970s (I was a Journal staffer 1969-1995).