After the headaches of animating Billy the baby in
Tin Toy, Lasseter backed away from depicting human characters. The team all agreed to do something simpler that would not "drive us all crazy," according to producer Ralph Guggenheim. In a discussion with the group, Lasseter brought up famed
Warner Bros. and
MGM director
Tex Avery, noting that his cartoons were wild and exuberant, yet not necessarily very complex. Lasseter collected snow globes and also enjoyed souvenirs from distant places; from those elements,
Knick Knack—the only pure comedy among Lasseter's early short films at Pixar—began to fall into place. A skeleton on the shelf in the short was a 3D model from an
Ohio State University skeleton data set called George, though the Pixar team stretched George's arms for comic effect. Also distorted were the two female characters—the bikini-attired woman and a mermaid—whose breasts were ultra-exaggerated thanks to a technical director who was a
pinup enthusiast. The singer
Bobby McFerrin created the musical soundtrack and
a cappella vocal jazz track which he improvised while watching a rough cut of the film. As the rough cut ended, the placeholder credits read
blah-blah-blah-blah, so he sang those words and it remained in the film's score. McFerrin did the score for free out of a belief that the film was cool to be involved with.
Gary Rydstrom of
Lucasfilm created the sound effects for the short. == Release and re-releases ==