More so because one is a straight-gelled hair look and the other, full of curls! It was really a time-consuming procedure and also required a lot of patience on Kunal's part.
It was also a high-alert zone for the assistant directors of the film who had to keep scrutiny and be on the alert to avoid any goof-up.
But as it happened due to some miscommunication between the unit members, one day Kunal came on the sets with his hair straight. And actually he was required with curly hair for that particular scene which was waiting to be canned!
Poor Kunal had to change his hair all over again (which took a few good hours to set up) since everything was set for his shot in curly hair!
But being the professional he is, not once did he complain... As for the A Ds and stylists, they must have had a tough time for sure!