On October 6, 1969, Jacqueline Kennedy Onassis was leaving a theater showing the film when she was confronted by paparazzi. She gave a photographer a judo flip in the confrontation.
This is widely considered the first mainstream film to openly show male full frontal nudity.
Olof Palme, who is interviewed in the film as a young cabinet minister, later became Prime Minister and was a major figure in Swedish and international politics in the 1970s and 1980s. He was often associated with left-wing causes including opposition to US involvement in Vietnam. Palme was shot to death on a Stockholm street in 1986, in a crime that has never been fully solved.
The interview with Martin Luther King was filmed in March 1966 when Dr. King was in Stockholm with Harry Belafonte to garner Swedish support for the American Civil Rights Movement.
In Marvel Comics' "The Amazing Spider-Man #101" (published in October 1971), Gwen Stacy suggests to Peter Parker that they see this film, adding he could cover her eyes "during the spicy parts".