Rumours spread during the production stages of the film that, it is a sequel to the 2014 film "Bang Bang!" It is due to director Siddharth Anand interview in which he suggested there could be a "Bang Bang! 2" with actor Siddharth Malhotra as the male lead. Even on the first day of the shoot, the filmmakers released pictures of Clapboard which reads "Not Bang Bang 2".
Suneil Shetty made a comeback after nearly 5 years with this film and this is the first film to have him in his new bearded look.
Jacqueline Fernandez and Siddharth Malhotra reunited after Brothers but they were not paired opposite each other in that film. A Gentleman was the first time that Siddharth Malhotra and Jacqueline Fernandez were paired together.
Sidharth Malhotra worked with Suniel Shetty for the first time
Jacqueline F. Had to chop her long hair into a lob/bob (long bob) for this role.