The Honda accord which Vidya owns shuffles between 2000 model and 2008 model throughout the movie.
During the return of Amol and Auro from Delhi, When they are on Plane stairs You can easily spot that the other Engine of Plane is covered with Red Cloth. Which means Plane was just standing there for long time.
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.