Continuity mistake: When Ann Margaret and Elvis are vying to win the big money prize, she is wearing a bathing suit under a white fur coat. Her hair is sleek. When she wins second prize (the pool table) she collects her prize in a pink dress and her hair is styled in curls on top of her head. This is the same dress and hairstyle she wore the night before in the bedroom dinner scene.
Factual error: Elvis and Ann Margaret take a trip in a helicopter over Hoover Dam and Lake Meade. They are flying in a small 2 seater copter with a bubble canopy and no doors. During the trip Elvis and Ann talk to each other without headphones or microphones in a normal tone of voice. In that type of helicopter, especially one with no doors, the sound would have been deafening and they wouldn't have heard each other even while screaming.