Goldie Hawn in an interview many years later, described Peter Sellers, her co-star on this film, as being "strange".

Adapted by Terence Frisby from his own play. The Broadway production of "There's a Girl in My Soup" opened on Oct. 18, 1967 at the Music Box Theatre and ran for 322 performances. Gig Young and Barbara Ferris were in the original cast.

The opening credits list an "assistant to the director", "assistant to the assistant director" and "assistant to the assistant's assistant".

Britt Ekland and Brigitte Bardot were possibles for Marion.

Rob Reiner did uncredited work on the script.

Fourth of five of collaborations of star Peter Sellers and "The Boulting Brothers" - Roy Boulting and John Boulting.

Actress Diana Dors received a 'guest' billing credit.

A novelization of the movie authored by Raymond Hitchcock was first published in 1972 around two years after the movie theatrically debuted in 1970.

Producer Nat Cohen and the Columbia Pictures studio acquired the film rights to the source play by Terence Frisby in 1967 around three years before the picture was made and released.

The film was made and released about four years after its source stage play of the same name by Terence Frisby had been first performed in London's West End in 1966. Frisby also wrote the screenplay for this movie version. The original West End stars were Donald Sinden, Barbara Ferris, and Jon Pertwee.

The picture was the seventh most popular film at the box office in England during 1970 according to the 30th December 1971 edition of "The Times" of London.

Yves Montand was on the list for Robert.

According to the DVD sleeve notes, the film's source stage production was a "long running London West End stage play". It opened in 1966 and ran for around six and half years right up until 1973 playing for over one thousand performances.

The "Daily Express" detailing Robert Danvers' mystery Cannes wedding is accurately dated Thursday May 27, 1971.

Goldie Hawn as Marion says it was for the best that she didn't date a certain guy because now "he's in the hospital with a dose." The term "dose" is slang for having gonorrhea. This is in reference to the fact that it may be cured with a single dose of antibiotic if treated early enough.

Peter Sellers as Robert Danvers injures his eye and says "I can't see anything. The string in my eye's gone." Most audiences miss the humor in this line. Seven years earlier, in the film Dr. Strangelove, Peter Sellers as Group Capt. Mandrake says (seriously) "The string in my leg's gone," to explain that he has a bad leg due to a damaged hamstring. In this film, the line is funny because the eye does not have a hamstring. It's also funny because it breaks the fourth wall by acknowledging that he is the same actor who said a similar line in a different movie.

Robert's car is a 1965 Rolls-Royce Silver Cloud III drop-head coupe by Mulliner Park Ward. This car was owned by Peter Sellers at the time. In 2020 these cars can be worth into six figures - and this one, owned by Sellers, even more.

Note the brief scene with Robert and Marion outside of the Saint-Tropez boutique of "hippic chic" designer Jean Bouquin, ostensibly dressed in clothes from his shop. He is most famous for dressing Brigitte Bardot during that time.

The bride arrives in a 1965 Rolls-Royce Phantom V Limousine by Mulliner Park Ward. This car can also be seen in Bloodline (1979) and Georgy Girl (1966), among other films and television productions. Only 832 Phantom Vs were made from 1959 to 1968. In excellent condition these cars can be worth $100,000, or significantly more in 2020.

Robert and Marion drive around the French countryside in a white 1964 Rolls-Royce Silver Cloud III convertible by H.J. Mulliner. This car can also be seen in Flic Story (1972). As with the other Rolls-Royce in this film, this car could be worth $100,000 or much more.