Conversation so far:
Who was cast for a role?
Shah Rukh was cast as the lead.
What was the lead character?
Om Shanti.
Are there any other interesting aspects about this article?
In preparation for her role, Padukone watched several films of actresses Helen and Hema Malini to study their body language.
What other work are they known for?
CANNOTANSWER.
Who was another person cast for a roll?
Rampal was approached by both Khan amd Shah Rukh at the latter's New Years Eve party.
What was were they approached about?
Rampal was initially reluctant to do the role as he felt it was "too evil" for someone like him.
Did he ever agree to do the role?
He agreed to do the role.

Question: Anyone else cast in an important role?
Self-contained rewrite: Anyone else besides Shah Rukh, Padukone and Rampal cast in an important role?