It was not that Rakesh Roshan had created a scene on the sets, but it was that his son, Hrithik Roshan could not give a scene before his dad. The scene was a seducing and a steamy one between Hrithik and Barbara Mori.
Now, Hrithik had no problem in doing the scene, but he was not comfortable in doing it in front of his dad. As a result, Anurag Basu had to request Rakesh Roshan to leave the sets, so that the scene could be completed.
We wonder how Hrithik's wife would have reacted to it, if she would have been in Rakesh Roshan's place. Anyways, Rakesh Roshan left the sets and the scene was completed.