Uma Thurman and Ethan Hawke became a couple during the filming of this movie. The two later married in 1998, and had two children, but divorced in 2005.
When Gattaca was first released, as part of a marketing campaign there were adverts for people to call and have their children genetically engineered. Thousands of people called, wanting to have their offspring genetically engineered.
Many of the "futuristic" buildings in the film are actually quite old. Many of these represent a type of postmodern architecture called "brutalism", which was popular in the 1950s. The two massive arches seen behind Jerome and Irene during their talk are actually the spillway of the Sepulveda Dam in Los Angeles, which was built in the 1930s.
The name "Gattaca" is composed entirely of the letters used to label the nucleotide bases of DNA. The four nitrogen bases of DNA (deoxyribonucleic acid) are adenine, thymine, cytosine, and guanine.
Was voted by NASA scientists the most accurate science fiction film ever made.