Alfred Hitchcock prepared the sequence involving Ida Lupino, and was to have directed it; scheduling prevented him, and it was directed by René Clair, who used Hitchcock's script.
All cast and crew worked without pay as an aid to war propaganda.
This film has more credited writers than any other.
The film takes place from 1804 to October 21, 1805; in 1820; in 1846; in 1847; in 1897; in 1907; from October 21 to October 22, 1917; on April 12, 1918; on November 11, 1918 and on March 8, 1941.