Katrina Kaif's introduction scene was shot on a nude beach. The production crew had to continually request people to move out of the frame.
Hrithik said that it was his then-wife Sussane who pushed and convinced him to do this film. Hence her name appears in the acknowledgements at the start
As a part of the promotions, the cast took an actual road trip from Mumbai to Delhi via Gujarat and Rajasthan
Anupam Kher played the role of Imran's (Farhan Akhtar) adoptive father (referred to throughout the film as Faisal or Abu) in a flashback scene that was cut from the final film
The Spanish song that plays while the three are in the car (SUV) on the way to Costa Brava is "Será mejor" by Muchachito Bombo Infierno
Interestingly, the words 'Zindagi Na Milegi Dobara' were there in the lyrics of the title song of Farhan's previous movie 'Rock On'. Further, there's a song called 'Dil Dhadakne Do' in ZNMD which was the next movie by Zoya and Farhan!
The La Tomatina festival shown in the movie was re-created in Buñol, Valencia, Spain with almost 16 tons of tomatoes specially flown in from Portugal
Mr Dubey (the Teacher with funny English) who is mentioned in the movie by the lead characters, was actually Farhan Akhtar's teacher from a school in real life
In the long scene where everyone is packing and leaving for the airport, the passport in which Mumbai Airport Immigration stamp is done is that of Bobby Deol and we can partially see his visa for Spain as well (timestamp 13.12)
The name game the trio play during the movie was first shown in Kuch Kuch Hota Hai (1998)
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