Actor Rob Lowe recalled that when his agent sent him the script by messenger, "a strange thing happened. I started reading it in the bathtub. I was only going to skim the first few pages. But by page 73, the water was cold, and I was totally into the character. We hadn't even discussed whether I'd do the picture . . . but I knew that nothing could stop me".
In his memoir "Love Life" Lowe said he improvised some of the fight scene when Danny breaks up with Debbie. Specifically Lowe said, "I don't love you anymore." This caught Moore by surprise (the two had been in a relationship in the past), so the gasp at that moment that Demi Moore gives is real.
Apart from Los Angeles, the film actually did do most of its shoot in the city of Chicago where David Mamet's source play "Sexual Perversity in Chicago" is set.
Actress Elizabeth Perkins recalled her first meeting with co-star Demi Moore. Perkins said: "We were fascinated by how much we didn't have in common. She'd never done a play, I'd never done a picture. There was plenty to talk about. When we arrived on the set, which would be our apartment, and found it decorated in detail for each of our characters, Demi said, 'Okay, which bed do you want?' We started giggling, we couldn't stop . . . and suddenly Debbie and Joan were friends . . .".
The original title of this film was "Sexual Perversity in Chicago" (taken from the play it is based on). The title was changed after many newspapers and TV stations refused to run ads for a film with such a title. According to The 80s Movies Rewind website, "the name of the movie was changed to "About Last Night" prior to release when the major TV networks warned that they would never air a movie that had 'perversity' in the title".
Tim Kazurinsky: The movie's screenwriter as Colin. In the previous year's Police Academy 2: Their First Assignment (1985), the same year's Police Academy 3: Back in Training (1986), and the following year's Police Academy 4: Citizens on Patrol (1987), Kazurinsky portrayed Cadet Sweetchuck.
Willie Gault: The 1986 World Champion Chicago Bears star receiver as the waiter at Debbie's company's Christmas party.