The pre-bed drinking ritual in the film Vicky Donor of Dolly and Beeji was inspired by the mother of director Shoojit Sircar. He would give her a shot of whisky at night to put her to sleep
Director Shoojit Sircar got the basic story idea for October from a small newspaper clipping, which he came across in 2015.
While shooting for October director Shoojit Sircar laid out a few rules for Varun Dhawan to be followed religiously. He instructed him to not use social media, talk softly, to be honest, to have minimal sleep, to not wear makeup, to not act like a celebrity and to reduce the use of phone.
Ashutosh Gowariker, Shoojit Sircar and Ritesh Sidhwani, all wanted to make Parmanu before John Abraham and KriArj Productions.