When Andrew regales the family with jokes, the jokes themselves were unscripted. Robin Williams ad-libbed all of the jokes. The other actors' reactions to the jokes and their laughter are real.

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.

Adam Bryant, who appears as the android head, has been Robin Williams' stand-in for more than a dozen films.

The three rules that govern Andrew's behavior are the Three Laws of Robotics, originally defined by Isaac Asimov in his science fiction stories.

Disney asked that the budget be cut by approximately twenty million dollars, and when the film was released on Christmas Day, it flopped at the box-office. Robin Williams blamed Disney's marketing, and the loss of content the film suffered because of the budget cuts. As a result, he fell out with Disney again.

The female robot, Galatea, is named after the statue brought to life by the gods in the Pygmalion myth.

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.

Third and final collaboration between Robin Williams and Chris Columbus, which started with Mrs. Doubtfire (1993) and Nine Months (1995). A plan to do a sequel to Mrs. Doubtfire had to be canceled after Williams's death.

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 car that Ma'am drives in the film is the same car used in Demolition Man (1993).

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.

Robin Williams later provided a voice in A.I. Artificial Intelligence (2001), which was also about a robot who wanted to be human.

Chris Columbus later admitted that although he wanted to direct the film to work in science fiction for the first time, the production ended up being more work than he was ready for and there should have been a different director.

The futuristic headquarters of "NorthAm Robotics" are actually the headquarters of Oracle Corporation, in Redwood Shores, California.

This was originally planned with Tom Hanks starring and Wolfgang Petersen directing.

Tim Allen was considered for the role of Andrew Martin, but turned it down due to his commitment on Galaxy Quest (1999).

The motorcycle used in the film is the Motó 6.5 designed by the famous French industrial designer Philippe Starck in 1995 for the Italian motorcycle company Aprilia. It's slightly modified to look more futuristic.

The film's main setting San Francisco is where both director Chris Columbus and actor Robin Williams were residents.

Isaac Asimov novella was originally published in 1976, the year the USA celebrated its own bicentennial.

Mel Gibson, Harrison Ford, Michael Keaton, Alec Baldwin, Bill Paxton, Jeff Bridges, Richard Dreyfuss, Howie Mandel, Martin Short, Billy Crystal, Jack Nicholson, Robert De Niro, Steve Martin, Dan Aykroyd, Bill Murray, Anthony Hopkins,William Shatner and Kurt Russell were considered for the role of Andrew Martin.

Robin Williams shaved off his considerable body hair to play the robotic Andrew.

The backpack Andrew wears when going around looking for surviving robots like him is made by Swedish company Boblbee.

In one of his later comedy routines, Robin Williams talked about how he regretted making the film.

Shot over a period of four months.

In one scene, Andrew refers to Portia's fiance, Charles, as having a chin that can sink the Titanic. The film's composer, James Horner, previously scored Titanic (1997).

Asimov's Three Laws of Robotics, which govern all the robots in his stories, are as follows: First Law - A robot may not injure a human being or, through inaction, allow a human being to come to harm. Second Law - A robot must obey the orders given it by human beings except where such orders would conflict with the First Law. Third Law - A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

The film takes place from April 3, 2005 to April 3, 2205.

It could be argued that Galatea did not contradict the Three Laws as, to leave Portia plugged in would have caused her more pain in the long run than simply ending the natural span of her life.

The second film in which Robin Williams plays a character that asks for his freedom from his master. The other being the Genie in Aladdin (1992).

The women in this film would have been having babies at old ages. The robot, Andrew was made in 2005. He lived for 200 years. Little Miss was about five or six in 2005. But her granddaughter, Portia, is Andrew's love many years later. When Andrew dies at 200, Portia is about 80. That means that there were about 65 years between the generations and thus, the average ages at which each person in the link conceived the next person. So, Little Miss would have been 60 to 65 when she gave birth to Portia's mother or father, who in turn would have been 60 to 65 when Portia was born. And, if Portia was alive as a young girl when Little Miss died, Little Miss would have been more than 125 years old.

This film and Mrs. Doubtfire have numerous similarities. Robin Williams stars, Chris Columbus directs, and San Francisco is the setting. In both films, the main character played by Williams undergoes changes to try to get what he wants. One is changed into an older woman so he can serve as a nanny to his own children, while the other is a robot transformed to be more human. Each makes a speech in court and is denied his rights by a biased older authority figure who says "nothing more." Each continues to fight for his rights and in the end gets what he wants: the nanny gets to be with his kids, and the robot gets his humanity.