Tuesday Weld told film critic Rex Reed that this was her favorite film and that she thought she gave her best performance in it.
Roddy McDowall - born September 17, 1928 - was 36 years old, playing a high school senior, when this movie was filmed in 1965 for its February 21, 1966 release. Roddy played opposite a 22 year old Tuesday Weld, but was the same age as Harvey Korman (as the school principal) and only 3 years younger then Lola Albright (Weld's mother).
Barbara Ann's sweaters as mentioned in chronological order: Grape Yum Yum, Banana Beige, Lemon Meringue, Pink Put On, Papaya Surprise, Periwinkle Pussycat, Turquoise Trouble, Midnight A-Go-Go, and Peach Putdown.
This film took nearly eighteen months to get to Britain and was shown (in an abbreviated version) in the lower half of a double-bill with "A Fistful Of Dollars". It was not press-shown or given much publicity, but the popularity of the Clint Eastwood film meant that it was widely seen, and it gradually built up a cult following. It was eventually televised in its full version.
Larry H. Johnson, listed as George Axelrod's co-writer on the film, was newly out of film school when he was hired; Axelrod claimed he thought of Johnson as "a kid we can exploit" when hiring him. He has had no other writing credits in films or television since.