Spencer Tracy wanted Katharine Hepburn for his screen wife, but it was felt that they were too romantic a team to play a happily domesticated couple with children, so Joan Bennett got the part.
MGM gave Elizabeth Taylor a wedding gift of a one-off wedding dress designed by Helen Rose. (A move also designed to promote this movie.)
One of the gifts Kay gets as a present is a Venus de Milo statue with a clock in the stomach, which Stanley T. Banks refers to as a "stinker". This same gift makes its way into El padre de la novia (1991), and it still is not received well.
To grasp the astronomical level of expense referred to in the film, the $400 cake in 1950 would equal about $5,000 in 2023.
The picture on the nightstand at which Spencer Tracy looks is an actual photo of Dame Elizabeth Taylor as a child.