The swimming pool at the Grand Hotel on Mackinac Island, MI, is named the Esther Williams Swimming Pool due to the hotel pool being used in the film.
The film is one of only two major Hollywood films to be shot on Mackinac Island, Michigan and at the island's Grand Hotel. The other is Somewhere in Time (1980).
Esther Williams was pregnant during filming. Unfortunately, a few months later she suffered a miscarriage.
This was the only film in which Johnny Johnston appeared during his brief tenure at MGM. Apparently, he became romantically involved with Kathryn Grayson during the filming of their duet in Till the Clouds Roll By (1946), despite the fact that Grayson was the object of an MGM executive's affections. (In his memoir, Mickey Rooney stated that this executive was instrumental in Grayson's rise at the studio). After Grayson announced their engagement, the executive took out his hostility on Johnston, first by axing all of his footage from "Till the Clouds Roll By" and then releasing him from his contract once filming was completed on This Time for Keeps (1947). Johnston headed to New York, where he found brief success starring in the Broadway musical "A Tree Grows in Brooklyn" (1951).