On 17 June 1999, crews filming in the brand new San Francisco City Hall building set off the sprinkler system, flooding hallways, causing serious damage, and angering San Francisco mayor Willie Brown.
The futuristic headquarters of "NorthAm Robotics" are actually the headquarters of Oracle Corporation, in Redwood Shores, CA.
Sir's actual name (revealed when he and Andrew go to NorthAm Robotics for the first time) is Richard Martin. Miss and Little Miss are named Amanda and Grace. When "Sir" and "Ma'am" are sitting on the bench in the yard, you can hear him say, "Rachel," and since the girls' names are revealed, this can be seen as "Ma'am"'s name.
The aria that Andrew is listening to when he first uses the record player is from Dvorak's opera "Rusalka." The opera is concerned with the fairy-tale story of a water nymph who wants to become mortal for love.
The female robot, Galatea, is named after the statue brought to life by the gods in the Pygmalion myth.
The three rules that govern Andrew's behavior are the Three Laws of Robotics, originally defined by Isaac Asimov in his science fiction stories.
In the original "Bicentennial Man" story by Isaac Asimov, the robot manufacturer was named "U.S. Robots and Mechanical Men". Around 1971, a new modem-manufacturing company took the name "U.S. Robotics", partly to honor Asimov. Unfortunately, since in the movie the robot manufacturing company is not portrayed positively, the real-world company asked the filmmakers to use a different name. Hence, "NorthAm Robotics". There are a few places in the film where you can see the old name and logo.
The car that Ma'am drives in the film is the same car used in Demolition Man (1993).
Adam Bryant, who appears as the android head, has been Robin Williams' stand-in for more than a dozen films.