When Annie is shown towing the floating dry-dock section to Alaska in dense fog, she is giving the correct whistle signal for sailing in fog - one long and two short blasts.
Co-starring husband and wife Ronald Reagan and Jane Wyman. Ms. Wyman was also pregnant with their daughter Maureen during filming.
The character of Tugboat Annie was based on Thea Foss, a Norwegian immigrant housewife who founded the Foss Maritime Co. in Tacoma, WA, in 1889. The film's premiere was held at the Roxy Theater in Tacoma on October 18, 1940. The stars of the movie were in attendance, as were Thea Foss' sons Arthur, Wedell and Henry, who were executives of the Foss Maritime Co.
The car Peggy drives to the dock to catch up with her father is a 1940 Buick Special 46C convertible coupe. Only 3,763 were made.