The total runtime of Visual FX in this movie was more than Jurassic Park: O Parque dos Dinossauros (1993) and was featured in Guinness Book of World Records for some time.
Originally the song "Anbe Anbe" was recorded with less percussion than what it has now. A R Rahman, who composed the song, gave it to director Shankar for picturisation. After seeing the visuals of the song, Rahman decided to add more sound effects to the song to make it rich.
The movie was initially titled "genes". Later the makers thought that the word "genes" would not appeal to semi urban and rural viewers . Hence they renamed the movie to a much trendy name "jeans" .
Raju Sundaram who plays the role of Aishwarya Rai's brother, is also the dance choreographer of the movie.
Part of the film's story line was based on the story of Sridevi's mother who had surgery on the wrong side of her brain.