While reading Baxter's book, I was struck by a passage which noted the similarities between the Blue Angel (1930) and the earlier Pabst production, Pandora's Box (1929). "Sternberg's concept for Lola was, as one might expect, an eclectic one, combining elements from other artists with aspects of his own life. Ignoring contemporary Germany, of which he knew little, he returned to the period of [Heinrich] Mann's book, the late Nineteenth century, and to another writer whose influence on German thought had been explosive, the playwright Frank Wedekind. To replace Mann's name for the heroine, Rosa Frohlich, Sternberg adapted 'Lola' from 'Lulu" of Wedekind's plays Earth Spirit (1895) and Pandora's Box (1905), but he also borrowed so heavily from Wedekind that in many ways The Blue Angel is a fantasy on the playwright's themes. Lulu, like Lola, is a dancer exercising a cold fascination over an older man, who sacrifices his reputation for her. She is surrounded by her past and future lovers . . . ."
Wow! Such similarities have occurred to me in the past, but I have not really seen them spelled out so succintly. And so early on - Baxter's book was published in 1971. Has anyone else ever seen an articles or books linking the films?