The Book that the protagonist reads in the opening scene "The Man with a Thousand Faces" was published in 1949 but the scene was set in 1937.
Lingeswaran character reads the book "The Hero with a Thousand faces" by Joseph Campbell, during train journey that is just before the fight sequence. This story is set in 1939 (before India's independence) but the book was originally published in 1949.
Lingaa holds his phone upside down while talking to Santhanam during the Emerald necklace heist, which is clearly shown by the position of the phone's front facing camera.