According to an article in The Hollywood Reporter from April 1945 MGM reportedly paid $150,000 ($2.1M in 2018) for the film rights to Lewis' novel.
Virginia 'Jinny' Marshland: Are you sure?
Cass Timberlane: Yes.
Virginia 'Jinny' Marshland: I thought you were a friend.
Cass Timberlane: An umpire has no friends.
When Cass talks to the cat on the bed, the position of the cat changes between shots.