In a moving train, lights from outside the train are supposed to move through a compartment but here, during the journey to the festival, the lights just appear and disappear as if they are being switched on and off.
The goof item below may give away important plot points.
In the climax scene, where Prakash Raj starts beating Vikram, Vivek switches on the candid camera which is fixed at the wall. And at the court, Vivek produces the cassette taken from candid camera. But the video seems not to be taken from the fixed camera.