Filmed entirely on location.
During the credits, there are some faked "goofs" during filming such as characters bursting out laughing, accidentally knocking over the camera, etc. One particular highlight is Flik yelling "To infinity, and beyond!"
Additional faked goofs were added to the movie on December 18th, 1998. The original set of goofs had such a great reaction that Disney decided to add more for a "reward" to people that see the movie again.
The film lists "production babies", which are the children born to the staff members of Pixar Animation Studios during the production of the project.
The Pixar trademark lamp that stomps down on the letter "i" of "Pixar" looks into the camera, then shuts off, on the very last note of the music.