The 33-year-old actor said Imtiaz wanted it to be a part of the film and he worked hard on getting the voice and nuances of the Bollywood legend right.
"The Dev Anand imitation was a part of the script. Imtiaz wanted that because Ved and Tara meet in a place and they decide they are not going to tell each other what our names are, where we are from, let's be different people so he becomes Don and she becomes Mona darling.
"Tamasha" has been majorly shot in Corsica and the "Barfi" star said the whole team had a great time shooting in the island.
The "Rockstar" actor also revealed that his co-star and ex-girlfriend Deepika has a fun side to her, which many people are not aware of.
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Ranbir shared that when Deepika and Imtiaz were working on 2009 romantic film "Love Aaj Kal", Imtiaz used "cheap talks" to break the ice with the actress, who then came across as intimidating and reserved.
"Imtiaz told me when he was working with her on 'Love Aaj Kal', she came as very reserved and he was thinking, 'How do I break into?'. One day I started talking really cheaply to her and she responded with a twinkle in her eye," he said.
"I was jealous because she was so enamoured by his looks. She would come and tell me that he is so good looking and he has such great hair. I used to look at Imtiaz with 'tashan'," the actor said before adding, "Imtiaz is a pure director, he really feels the parts and the emotions so he expects his actors to be pure."