When Harvey Miller Jr. pushes open the caddies' shower room with soap in his eyes the door is made of glass. When he next appears exiting the room the door is made of wood.
Tom Harmon's radio broadcast of the Santa Barbara tournament is heard over the PA system at the golf course. But this would not occur because it would distract the golfers.
When Miller accidentally shoots Mr. Baxter with a pop gun, the wire used to "pull" the dart off Baxter's face is visible. (The scene was filmed with the dart being pulled from his face and was played in reverse).
Joe is twice seen walking down Pacific Coast Highway "heading for San Francisco." However, from Monterey he would actually need to walk in the opposite direction.
When leaving motel room 108 and getting into Donna Reed's speedster Martin puts his golf clubs in the trunk - but it doesn't close fully and visibly bounces back up a little.