One simple scene where she enters the hotel room and asks "Where's the bourbon?" required 81 takes. Marilyn often wouldn't emerge from her tailer until 3 in the afternoon when first call had been 9 AM.
The American Film Institute rated "Some Like It Hot" the #1 comedy of all time. I like the movie well enough, personally, but just not that high.
Wilder let Cary Grant screen Tony's accent before the movie had general release. He is reported to have said good-naturedly, "No one talks like that."