The sources for these facts can be found at: imdb.com
1. Billy Crystal was originally offered the chance to voice Buzz Lightyear, but declined. After seeing the finished film, he said the decision was the biggest mistake of his career. Upon learning this, John Lasseter telephoned Billy's house to offer him the role of Mike Wazowski in Monsters, Inc. (2001). Billy's wife answered the telephone and said "John Lasseter wants to speak to you." Billy took the telephone from his wife and said "Yes".
2. Sid Phillips is said to be inspired by a former Pixar employee of the same last name who was known to disassemble toys and use the parts to build bizarre creations.
3. This was the first animated film in Oscar history to be nominated for a Best Screenplay Academy Award - Adapted or Original.
4. Tom Hanks recorded his dialog during the breaks of Sleepless in Seattle (1993) and A League of Their Own (1992). He didn't want to record his dialog during the breaks of Philadelphia (1993) or Forrest Gump (1994) because he felt he shouldn't do comedic roles in between minutes of playing serious roles.
5. The animation team perfected the movement of the toy soldiers by nailing a pair of sneakers to a sheet of wood and trying to walk around with them on.
6. The toolbox on top of the milk crate that Woody is trapped in is a Binford, the same type of tool that Tim Allen used on his television show Home Improvement (1991).
7. Early scripts for the film featured a Barbie doll in a prominent role as Woody's love interest. The original ending sequence, in which Buzz and Woody chase the moving truck, was scripted to have Barbie drive her Corvette off the truck and rescue Woody and Buzz from Sid's dog, a-la Sarah Connor (Linda Hamilton) in Terminator 2: Judgment Day (1991). Mattel, the company that owns the Barbie character, declined on the basis that they thought the film would be a failure and that they didn't want Barbie to have a defined personality, preferring to let children imagine Barbie's personality traits on their own. Thus, Barbie was dropped from the script, and her character was reworked into that of Bo-Peep. When the film proved a huge success, Mattel did allow Barbie to appear in Toy Story 2 (1999).
8. Whenever a character's eyes blink, they never blink together, but one at a time.
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9. Hasbro denied Pixar the use of the name GI Joe when it was informed that a GI Joe doll was going to be blown up by Sid.
10. When Woody is sitting on the bed talking with Slinky, there is a drawing of him on the wall behind them. This is actually an early sketch of the Woody character.
11. What attracted Tom Hanks to the role of Woody was the fact that, during his childhood, he would always wonder if his toys were alive and moved around when nobody was in his room. What attracted Tim Allen to the role of Buzz Lightyear was the fact that, before him, they offered the role to his biggest influence in his career, Chevy Chase, who turned it down.
12. Jeffrey Katzenberg often gave notes that he wanted more edge. Pixar presented an early draft of the film to Disney on November 19, 1993. The result was disastrous. The film was deemed unwatchable and John Lasseter recalls simply hanging his head in shame. It presented Woody as a "sarcastic jerk" who was constantly insulting the other toys. Katzenberg took Walt Disney Feature Animation president Peter Schneider in the hall after the screening and asked him why it was bad, Schneider responded that it "wasn't theirs anymore." Disney immediately shut down production pending a new script. The story team spent a week on a new script to make Woody a more likable character, instead of the "sarcastic jerk" he had been.
13. In 2013 the original film was remade shot-for-shot with real toys and real people shot for shot. It took Jonason Pauley and his friends 2 years to complete the 82 minute film.
14. When the Pizza Planet delivery boy enters the Dinoco gas station, he asks for directions to West Cutting Boulevard. West Cutting Boulevard is the street where Pixar Animation Studios was located in Richmond, California, at the time (Pixar moved its entire operation to Emeryville, California, in 2000).
15. All of the cars in Toy Story have license plate stickers that are dated November 95 - the same date the movie was released.