This is the second time Amitabh Bachchan draws inspiration from a Robin Williams film. The first was Aladdin (1992), which inspired Bachchan's performance as Genius in Aladin (2009). This film was inspired by Jack (1996), which stared Williams in the eponymous title.
During the "Mudi Mudi" song sequence covering Vidya and Amol's meeting and courtship in Cambridge, there are a number of close-ups of Brasenose Lane. Brasenose Lane is in Oxford, not Cambridge.