Character mistake: The crew many times refers to the sub as a ship - subs are always called a boat.
Ice Station Zebra (1968)
1 character mistake
Directed by: John Sturges
Starring: Ernest Borgnine, Rock Hudson, Patrick McGoohan, Jim Brown
Factual error: "Ice Station Zebra" is one of dozens of films which make the mistake of showing people carrying rifles such as M-16s with the magazines inserted. In the scene where Marine Captain Jim Brown arrives at the submarine via helicopter, he comes aboard passing his M-16 through a hatch with the magazine inserted, barrel first - a double safety violation. I first saw the movie in a Marine Corps base theater, and all of us yelled at the screen when we saw that.
David Jones: May I ask, Captain, when we expect to reach the ice barrier?
Cmdr. Ferraday: Yes, you may ask.
Trivia: The famed aviator Howard Hughes was supposedly obsessed with this film, and sources claim it was his favorite. In his later years as a recluse, he allegedly would watch this film daily in his private theater.