Near the beginning, after Philip is watching Sylvia through binoculars he is looking through a fashion magazine with half-naked women. The model he is looking at in the pages is Gia Carangi, who was a famous model in the early 80s. A film was made about her (Gia (1998)).
According to the 80s Rewind website, about two years after this movie actress Sylvia Kristel appeared in Private School (1983) "only as a contractual obligation to the producers of this movie. She had previously worked with them in another "Private" movie . . . Private Lessons (1981)".
The movie was cut and released in a modified version for the film's original theatrical release in a number of territories including the UK and Australia. Around thirty years later, the cut version is still the only one available in both of these markets.
"Although [Sylvia] Kristel bares her breasts frequently, an unmatched stunt double [Judy Helden] is used for her disconcertingly in several of the nude scenes" according to show-business trade paper 'Variety'.
The name of the secondary school was the "FREDRICK Douglass High School". Its namesake is obviously the famed abolitionist FREDERICK Douglass, but it is unknown if the spelling of his first name in this film was in error or deliberate.
The movie was a "surprise box-office hit" according to film critic Leonard Maltin. Moreover, Allmovie concurs and states that "surprisingly, Private Lessons (1981) was a box-office hit at the time of its release".
Publicity for the later movie Private School (1983) did sometimes, rightly or wrongly, report that it was a sequel to Private Lessons (1981). Both titles had title similarity, the presence of actress Sylvia Kristel, the same producer R. Ben Efraim, and American video distribution through MCA/Universal.
After viewing a rough cut of the film in the summer of 1980, the producers decided to alter the film by downplaying the blackmail part of the plot and focus on the seduction of Philly by the maid. This required new footage to be filmed.
Quoted from the American Film Institute: "An article in the 3 Jun 1981 Var reported that Vision Features Corp. filed a $15 million lawsuit against Barry & Enright Films and R. Ben Efraim in U.S. District Court in New York. Breach of contract claims included non-payment of fees and expenses, failure to consult with Vision's president Irving Oshman on the film, and lack of proper credit. The outcome of the suit has not been determined."
The film was rejected by a number of distributors, most notably Universal. In an effort to find a distributor, the film was test-marketed in selected markets and did well. Only then did a distributor agree to pick it up, a brand new company called Jensen Farley Pictures.