The film is about a red unicycle named Red, who dreams of becoming the star in a circus act. In his dream, a clown called Lumpy is seen riding Red and juggling. He almost drops one of the balls, but Red bounces it with one of his pedals and gives it back to Lumpy. Lumpy accidentally dismounts Red and continues juggling (and "pedaling") until he suddenly notices that he isn't riding Red, and falls to the ground, at which time Red begins to juggle the balls, and when he finishes, the crowd cheers. He starts to bow, and then soon wakes up, realizing it was just a dream. Sad at this realization, Red slowly goes back to the clearance section of the bike store, and he falls back to sleep.
According to John Lasseter, Ed Catmull wanted the Pixar staff to make a film using the Pixar Image Computer and the rendering software Chapreyes. Lasseter began to develop the story of a circus clown who is upstaged by his own unicycle while at the same time, animators William Reeves and Eben Ostby starting working on their own separate ideas. Ostby had wanted to animate a bicycle, and Reeves began working on a city during a rainy night. Ultimately, the three combined their ideas, which resulted in the creation of Red's Dream.
- On the wall near the Clearance Section, a clock can be seen with a picture of André from the short The Adventures of André & Wally B..
- Towards the end, after Red has his dream, look for a Luxo lamp left of the Andre clock.
- The floor on the circus ring during the dream is a texture of a ball from Luxo, Jr.
- This is the only Pixar short that was never released with a Pixar film.
- Red and Lumpy appear in a cameo in Toy Story 2 on the television screen.
- Red is seen in WALL-E as part of WALL-E 's collection, right after he is launched into the side of his home.
- When you first see inside the shop, opposite to the bikes there is from Bill Reeves and Alain Fournier's 1986 animation test, Flags and Waves.
- The name Red's Dream appears on a book in Toy Story.
- This is the only Pixar film that used the Pixar Image Computer for rendering. The computer was powerful enough to support the entire Reyes rendering system, so they had to trim down the software to only a few basic functions (called ChapReyes). Due to the limitations, only the dream sequence of the film is rendered on the Pixar Image Computer, and there is no motion blur.