What was the difference between Bottom and Titania's love scene in the 1935 and 1999 adaptations of "A Midsummer Nights Dream," and why did the directors differ in their interpretation of the scene?

The main difference between the 1935 and 1999 love scenes involving Bottom and Titania is that the latter involved demonstrations of overt sexuality. In the 1999 adaptation of Shakespeare's play, Bottom was played by Kevin Kline, and in the 1935 version, he was played by screen legend James Cagney.
In the 1999 film version, Titania (played by the sexy Michelle Pfeiffer) is seen to openly seduce Bottom. She places his hand on one of her breasts and moves sensually against Bottom's body. Bottom and Titania take turns being on top of the other in their forest love scene. At one point, Titania presumably looks down in the direction of Bottom's crotch. She smiles knowingly, and her fairies titter. Viewers get the idea that Bottom has had an erection. So, the 1999 version explores Titania and Bottom's sexual attraction in a more overt manner than the 1935 version.
In the 1935 version, Titania is played by Anita Louise. Louise's Titania is just as beautiful as Pfeiffer's, but Louise injects a hint of wholesome innocence into her performance. Although Titania is seen holding Bottom in her arms, leaning on top of him, and sitting closely against him, the scene displays none of the overt sexuality present in the 1999 film adaptation.
The 1935 version was directed by Max Reinhardt and William Dieterle, while the 1999 version was directed by Michael Hoffman. Hoffman presumably desired a Shakespearean adaptation that reflected society's increasing acceptance of overtly expressive sexual behavior onscreen. In the 1990s, directors experimented with portraying sexuality with greater candor and clarity. That is probably the main reason the 1935 adaptation differs from the 1999 version in terms of Bottom and Titania's love scene.