For a character Vikram had to go through a makeup session of 5 to 7 hours daily.
Vikram for a character had to lose up to 30kgs of weight, because of losing too much weight he lost his resistance, during shooting he used to shiver hearing anything loud.
Vikram appears in various looks throughout the film. He has lost weight for portions of "I". He has also put on muscle as he will appear as a super model in the film.
A huge indoor set which was about an acre in terms of area was erected for the Beast song in this movie, It took 3 months for designing the set and another 3 months to complete the set.
During the post production stage of 'I', Vikram dubbed his voice for multiple characters he portrayed in the movie, in three different languages, i.e. For Tamil, Hindi, Telugu. He used to travel between Chennai, Mumbai and Hyderabad daily till his part of dubbing was complete in all the three languages.