On the last day of shooting, James Garner broke two ribs after trying to dive over the camera during the D-Day landing scene with James Coburn.
All of the packaging on the food, drink and luxury items in Charlie's room are strictly 1960s. Especially noticeable are the liquor boxes. They're all cardboard. In the 1940s they'd have been made of wood.
The majority of the male main cast members who played U.S. Navy Officers or NCOs, James Garner, Melvyn Douglas, James Coburn, William Windom, Edward Binns, and Alan Sues, were U.S. Army veterans. Douglas served during World War I; Windom, Sues, and Binns served during World War II; and Garner and Coburn served during the Korean War.
Julie Andrews' only feature film in black and white. Though Cinderella (1957) was also black and white, it was originally a television broadcast.