Watching Pursuit of Happyness again...ok movie but I love the fact its a true story - but quite losely based by all accounts
Anachronism
Throughout the film, Will Smith's character is often shown on the BART system, but even though the train network opened on September 11, 1972,
it was not yet fully built out in its present form in the year the movie was set, 1981 (although at that time, all of the main BART subway lines within the cities of San Francisco, Oakland and Berkeley were in daily revenue service).
In 1981, many of the buildings shown in the San Francisco skyline shots were not completed yet, although the major, identifiable buildings- Transamerica, B of A, Alcoa, etc., were.
Although in the film Chris is selling Bone-density scanners the equipment for this technology was not invented until 1987, while the film is set six years earlier.
When Chris is running in the city you can see a man on a cell phone.
When Chris initially looks around the Dean Witter offices, there is a Togo's cup on a co-worker's desk that used a current logo at the time of shooting.
Also when Chris and Christopher is at then-Candlestick Park now Monster Park, the stadium surroundings contain present-day logos of the San Francisco 49ers,
Monster Cable, and Coca-Cola signs as the scene pans through the stadium. Also, you can see members of the 2005-2006 49ers playing on the field.
Differences between the film and actual events
Most significantly, Gardner's internship was a $1,000 monthly stipend, but the film claims "there was no salary."
Linda never existed. The mother of his child was "Jackie," his mistress whom he left his wife for when she became pregnant.
Also, she initially took Chris Jr. away for many months before bringing him to Chris to raise. They were never married but eventually had another child together.
While the film shows Chris Jr. at the age of five, he was only two years old at the time of the events of this film.
Because of the age of Chris Jr., the interactions in the film did not occur. However, the scene where Chris tells him "You're a good poppa" did, in fact, occur.
The Rubik's Cube incident never happened. Smith came up with that idea, because he has always been fascinated with Rubik's cubes.
He actually spent ten days in jail for not paying his parking tickets.
He eventually started at Bear Stearns.
The actual events and his homelessness happened over the course of a few years rather than a short time as shown in this movie.
He sometimes spent the night underneath his desk when the shelters were full.
Gardner quit his job as salesman before entering the stock broker training program.
Gardner's medical equipment was never stolen from him.
In the movie Gardner states that he is from Louisiana, but Gardner is actually from Milwaukee, Wisconsin. However, Gardner's book indicates that his father resided in Louisiana at that time.
Gardner was not hit by a car.
The IRS did not seize money from Gardner's bank account.
He met with the "red Ferrari" man after the initial meeting to learn more about what the job involved. It was not simply a one-minute conversation.
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Just noticed 
