The only reason Ajay Devgan agreed to do the film was because his home production Shivaay got delayed. This gave him 3 free months.Seeing that he was not busy, the producers approached Ajay and promised him the film would be completed in 12 weeks.
The movie is inspired by the Malayalam story written and directed by Jeethu Joseph. As a possible tribute to him, when Ajay Devgan's character makes an entry in a hotel register, he signs his name as Jitu Joseph.
Bollywood movie is the remake of Mohanlal starrer Malayalam movie of the same name which holds the box office record for the second highest grossing Malayalam movie ever.
Shriya Saran (Nandini), who is the mother of Anju (Ishita Dutta), is only 8 years older than Ishita in real life.
Some of Drishyam's plot is similar to the Japanese novel 'The Devotion of Suspect X' by Keigo Higashino. Ekta Kapoor, who acquired the rights of this novel in India, sent a legal notice to the makers of the Malayalam movie.
The flim is also based on Nepali folk stories which has been heard since generations. On that story a dumb man kills her lover and his mother replaces the dead body of that girl with a dead goat.
The shoot for the film commenced in March till May and in May it was decided the film will release in July