Toy Story was originally going to be based way more closely on John Lasseter's 1988 short film Tin Toy. The main character, Tinny, would get lost during a family trip and join up with a ventriloquist dummy to find his way back home. Tinny eventually became an astronaut toy and the dummy morphed into a cowboy named Woody. (Source)

Mattel refused to allow Barbie to be used in Toy Story (she was supposed to be Woody's love interest) because they didn't want Barbie to have a defined personality on film. They also thought the movie might flop. Everyone's favorite blonde finally makes an appearance in Toy Story 2 and Toy Story 3 instead. (Source)

When the original movie came out, Hasbro and Mattel declined to make Toy Story-themed dolls because they didn't think they could get products out to stores on time. So, Pixar partnered with a small Canadian company called Thinkway Toys instead. (Source)

Two-time Oscar winner Tom Hanks is far too busy to do the voice of Woody for all the dolls or games that feature the cowboy, so his younger brother, Jim Hanks, does Woody's voice instead. (Source)

The Pizza Planet delivery truck that Buzz and Woody ride in has also appeared in every single Pixar movie (except The Incredibles). (Source)