In December 2009, Gergely Barki (an art researcher at Hungary's National Gallery) was watching the film with his daughter, and saw a painting on the wall in the background of the Little apartment. He recognized it as the long-lost work "Sleeping Lady with Black Vase" by Robert Bereny, which Barki had only ever seen as a black and white photograph from 1928. Barki hunted the painting through the studio, finding it had been purchased from an antique shop by an assistant to the set designer for five hundred dollars to use in the film. She then purchased it from the studio once the production was completed. The painting was sold by the American owner to a collector. As of November 2014, the painting was to be auctioned in Budapest, with a starting price of one hundred ten thousand euro (one hundred thirty thousand U.S. dollars).
A set decorator assistant for the film purchased an abstract painting for five hundred dollars in an antique shop in Pasadena, and used it as a set prop. It is visible in several scenes hanging above the fireplace in the Littles' living room. Hungarian National Gallery art historian Gergely Barki recognized the painting while watching the film in 2009 as a work by Hungarian artist Robert Bereny titled "Sleeping Woman with Black Vase". The painting had not been seen since the late 1920s, and was considered lost. Barki tracked down the painting, which had been bought by the set decorator assistant after production on the film had ended, and was later sold to an art collector. The painting was auctioned in December 2014 in Budapest with a starting price of one hundred ten thousand euros (one hundred thirty thousand U.S. dollars).
Grandma Estelle Little (Estelle Getty) and Grandpa Spencer Little (Harold Gould) also appeared together on The Golden Girls (1985), as Sofia Petrillo and Arnie Peterson / Miles Webber, respectively. In this movie, they are married, but on The Golden Girls (1985), Gould played the boyfriend of Rose Nylund (Betty White).
In the 2017 British television show Celebs Go Dating actor Jonathon Lipnicki revealed on an intimate date that the character Snowball was based on a cat that director Rob Minkoff had growing up. He also revealed he took the cat home after shooting finished as he had formed such a bond with it.