This is such a good movie. Interestingly enough, I guess Spencer Tracy did not Irene Dunne and made her life miserable on the set. I love Irene though, not a big fan of him...but they were good in it together, and of course, with Van Johnson.
I have read several accounts of Spencer Tracy's alleged rude on-set behavior towards Irene Dunne. He supposedly also made what were then described as "passes" towards her. In other words, if the movie were being made today, Miss Dunne would be just one more member of the #MeToo movement. I think "passes" is old Hollywood code for sexual harassment. Too bad he couldn't have treated her like a human being and a colleague.