During the final interrogation scene, Sahadevan is seen kicking Georgekutty, leaving a boot mark on his shirt. This mark disappears in the next shot.
Varun is seen using a Galaxy smart-phone which uses mini/micro Sim. But when cleaning the room, Georgekutty finds a normal Sim.
Georgekutty says at the start that there is no mobile network in his area, but can see a Police Officer and Rajesh (georgekutty's aliyan) calling in a Mobile somewhere in the second half.
While Antony is walking to the Tea Shop in the first scene, you can clearly see the crew members' shadows and reflections in a mirror.