Towards the end of the movie when Vijay and Deepak are fighting while Bharat is trying to escape on Deepak's motorcycle, Vijay's "amputated" right arm can clearly be seen hidden behind his back, under his shirt.
Vijay is one-handed but has both hands on the motorbike handles twice during the fighting scene in the end.
When Vijay was given money by a man who commit arson to a college, the man had one voice, but when handing the money to Vijay, his voice changed.