The woman Nick meets in the bookstore and her baby were played by Maria Goretti, Arshad Warsi's wife, and their son Zeke, who were in Melbourne with the crew during the shoot.
While Preity G Zinta is doing her radio show (at the beginning), a white board behind her lists the programme's times, names and guests. The guest for the 2:00 show is listed as "Sid Anand", a nod to director Siddharth Anand.
Preity G Zinta's then-boyfriend Ness Wadia was in Australia during the final round of shooting and appears in the film; he is the man sitting next to her near the back of the bus.
In both the released and deleted scenes, while arguing with Ravi Khote in the restaurant, Saif Ali Khan insists that Khote speak English or Hindi because he does not understand Bengali. In real life, Saif Ali Khan is Bengali on his mother's side and speaks the language fluently.
It was the third Yash Raj film with Abhishek Bachchan in a guest appearance to be released within as little as 15 months; the others were HUM TUM (2004) and NEAL N NIKKI (2005), both of which also starred Saif Ali Khan.