One of the American soldiers shot dead by the Cuban firing squad reappears minutes later as a Cuban guard.
During the escape from the Cuban prison, the background constantly switches between day and night.
At one point, the men running across the screen, get about half-way across, then re-appear on the left side running again.
Cherokee Jack's airplane changes in mid-air from a Cessna 170 to a Cessna 150, with a completely different registration number.
Three men talk by a parked pick-up truck. In some shots, the truck is a Studebaker with a rounded roof and fenders. In other shots, it's an International Harvester with a squared-off roof and fenders.
When Cherokee Jack is flying Griffin, Cook, and Landis down to Cuba, rain spatters flat against the right side window of the airplane and runs straight down. If the plane had actually been in flight, or even running, the drops would be blown almost horizontally across the window.
During the chase at the end of the movie, the police cars' tires squeal in the dirt.
The planes at the Cuban airstrip have American registration numbers. Cuban registration numbers would begin with CU, but every single aircraft registration in this airport has the US prefix of N.