When Cathy and Connie are going to sleep after Cathy's first day with Mr. Shayne, Connie places the card from the unwed mothers' home next to the clock, but when Cathy wakes up at 2:30 a.m., the card is next to the phone.
The take-off and landing shots depict a Pan Am Boeing 707, but the inflight shots are of a Pan Am Douglas DC-8. Both were operated by the airline at the time, but were built by competing manufacturers.
The aircraft Cathy is depicted as leaving New York in is not the same one shown landing in Bermuda. Both are Pan Am 707s, but the one leaving New York, named "Clipper Tradewind" has registration N709PA. The one landing in Bermuda has registration N729PA.
When Roger falls down the stairs at Cathy's apartment building, the stuntman's final positions on the landings after falling are different from the positions from which Gig Young stands up.
When Philip and Cathy are driving up to the hotel in Bermuda, he is driving: on the right side of the road - in Bermuda, one drives on the left and the car is a lefthand drive. While Bermuda doesn't have car rentals and only residents are allowed to own cars, it can be assumed that Shayne has the means of borrowing a car from a friend there.
Conversations at the Automat between customer Cathy and worker Connie could not have occurred as shown. Automat compartments were refilled by means of a revolving drum that made it impossible for a customer to make contact with anyone working behind the wall.
When Shayne address the U.N. General Assembly, he is speaking from the United States' seat. It is shown between the United Kingdom and Venezuela. Later, the U.S.S.R. representative is shown applauding. The United States should be sitting in between the U.S.S.R. and the United Kingdom.
Shayne says "there is no television" in Bermuda. In fact, ZBM-TV began broadcasting in 1958, becoming a CBS affiliate in 1960. Before that, people living near Kindley Air Force Base could pick up broadcasts from there.
In the American Credit Card Univac room, a customer record (card) was reviewed. The card was a Hollerith (IBM) card, not a Powers card (Univac).
When Shayne and Roger are talking in the office, Shayne is drinking from a teacup. The camera angle is from behind Shayne's right shoulder, and, as he raises the cup, it can be seen that the cup is empty.
The final scene in the park is shot against a rear projection. It's so obvious, you can see a blue boundary/halo around each actor.
Assuming she tumbled over the balcony head-first, Cathy should have landed on the canopy face-up, not face-down, with her feet pointed toward the street, not toward the hotel.
The bottle on Cathy's big toe is plastic, as evidenced by the way it flops around when she wiggles the toe. Were the bottle glass, gravity would pull it and the toe down, making it very hard for her to move either.
When Roger calls his psychiatrist from his office none of the buttons on the phone are lit.
When Philip gets out of the back of the chicken truck, the boom is visible on the door.
Shayne books an entire jumbo jet to fly Cathy to Bermuda--an unnecessary expense, as it's already been established he owns a private jet.