One problem
The Bill Powell character married the Myrna Loy character because he determined that his marriage to Jean Harlow was not valid because her Yucatan divorce was valid.
Here's the deal. Harlow had missed at least three wedding dates with Spencer Tracy, so if Tracy had ever shown up on time, that marriage would not be valid (and by corollary, the entire start of the picture would be meaniness).
It would seem to me that the Powell character would have been smart enough to realize this and to realize that either Tracy or Harlow would have figured that out to have made arrangements to correct that matter.