Margaret is scared that in anger Anna, as always, will do something foolish. Anna is impulsive, says Margaret. So she should remember 'Mama" before doing anything on haste and sullying the family name! But Margaret has other plans. She is too strong to break down so easily and her getting even will be only too entertaining.
Cary Grant starts of in a very mellow fashion in Indiscreet. He is suave and handsome but he does not have too many dialogues in here. In fact, in the ballroom scene when he suddenly starts dancing too much, I think it does not go with his prim and proper persona. But his romantic scenes with Bergman were remarkable.