Sanjeev Bhaskar says he used 42 for the show's house number because he was heavily influenced by Douglas Adams's radio series "The Hitch Hiker's Guide to the Galaxy" when he was growing up.
Although Meera Syal plays the grandmother of Sanjeev Bhaskar's character, she is only three years older than him (almost to the day). While in production for The Kumars, Syal and Bhaskar married.