The prosecution led off their case with a parade of witnesses, all of whom had stayed with us that week in Winthrop, each of them testifying to Denny’s inappropriate flirtatious manner and his predator-like stalking of Annika. Yes, they agreed, she was playing the game with him, but she was a child! (“As was Lolita!” Spencer Tracy might have shouted.) Denny was an intelligent, strong, good-looking man, the witnesses said, and should have known better. One by one, they depicted a world in which Denny maneuvered sneakily in order to be with Annika, to brush against her, to hold her hand illicitly. Each convincing witness was followed by another even more convincing, and another after that. Until, finally, the alleged victim herself was called to take the stand.
(Garth Stein, The Art of Racing in the Rain)
I know what the highlighted phrase means from the storybook, Lolita. But I don’t find any film that Spencer Tracy was casted into. Is it famous words? Whoever knows from where it comes?