Collection of in-jokes in PIXAR films

As the story goes, a few folks at SIGGRAPH 1987 told John that they thought that it was really clever that "Red's Dream" had referenced Pixar's first SIGGRAPH submission, "Luxo Jr." Which suggested that there was some sort of connective tissue between these two animated shorts.

Which -- let's be honest here, folks -- was NOT what John Lasseter & his team of animators were trying to do when they were working on "Red's Dream." Truth be told, these guys were just looking for a quick-and-dirty way to add some additional color to that film's dream sequence. But given they seemed to get extra points with the people at SIGGRAPH for trying to be clever ... Well, in-jokes and self references then became a way of life at Pixar Animation Studios.