Trivia: The train that the circus bugs use is called "Casey Junior", which is also the name of the circus train in "Dumbo."
Trivia: In the movie A Bug's Life, when Flik enters the city, a code on one for the old boxes he passes reads A113-1195. When John, the creator of the movie was in the first year of the Character Animation Program at California Institute of the Arts, the classroom was numbered A113. That number is also on the license plate of Andy's van in Toy Story. John says it will probably be in all his movies. He added 11/95 because that was when Toy Story opened in theaters.
Trivia: When Flick enters the 'big city,' look at the big "human objects" like the ice-cream carton and such. The names on the carton are named after the director's children and relatives.
Trivia: In the scene where Flick is just arriving at 'the big city' after the one fly gets toasted by the bug zapper. Shortly afterward, in the big city, which is made up of garbage, there is an old Pizza Planet paper cup in this scene.
Trivia: The voices of the two bugs blinded by the light of the bug zapper, right before the "city" scene, are actually the voices of the two directors John Lasseter and Andrew Stanton.
Trivia: The first Pixar film to feature outtakes.
Trivia: During the warriors' introduction, Slim whispers to Heimlich, "Wow, they sure are starved for entertainment" - a direct quote from the similarly themed The Three Amigos, a comedy film where the plot involves three out-of-work actors that are hired to defend a town from "real" bandits.