According to "Story Of The Scene: 'A Private Function', Malcolm Mowbray, 1984" published in the 25 April 2008 edition of 'The Independent', actress "'Maggie Smith' found herself obliged to vault over the back of one porker when she was hemmed in during one kitchen scene, and everyone on set was traumatized by their earthy nature". The pigs used in the movie were "unpredictable and often quite dangerous".
For the scene where Betty the Pig needed to travel in a car towards the end of the movie, the pig would not co-operate and initially would not get into the vehicle. The set-up required the porker to ride in the back-seat, but when the pig did get in, it then jumped into the front seat, and onto the lap of actor Michael Palin, who stunned, sat their grinning.
The movie was nominated for 5 BAFTA Awards including Best Film and Best Original Screenplay (Alan Bennett). The picture won three BAFTAs, Best Actress (Maggie Smith), Best Supporting Actress (Liz Smith) and Best Supporting Actor (Denholm Elliott). As such, both actress acting BAFTAs for this movie were won by actresses who were last named "Smith".
In supporting roles, the movie featured two English actors who would become more prominent with the public after this picture. They were British thesps Richard Griffiths and Pete Postlethwaite. Both sadly passed away at about the same age of 64 - 65 during the early 2010s.