According to Ingmar Bergman, Svensk Filmindustri submitted the film to that year's Cannes Film Festival without informing him. Bergman claims he found out when he was reading the newspaper, saw the headline "Swedish Success at Cannes," and soon realized they were talking about his film.
This light, frothy piece (in terms of Ingmar Bergman's general oeuvre) was made whilst the director was undergoing financial troubles, stomach pains (he weighed only 125 pounds at the time) and a romance with Harriet Andersson that was on the rocks. Bergman later said that if he hadn't made this film when he did, he probably would have attempted suicide.
The trivia item below may give away important plot points.
In Ingmar Bergman's Summer with Monika (1953), Åke Fridell plays the father of Monika, whose part is performed by Harriet Andersson. In this Bergman film, made only two years later, Fridell this time plays the part of Andersson's character's lover. In real life, the two were twelve years of age apart.