On the opening credit debate. All movies used to open with all the credits first. I think that changed in the 1960s. However Citizen Kane (what else?) bucked that in the 1941. It appears that the first sound picture to do this was Fantasia, but unlike CK, it's a non-linear collection of "music videos."
While researching I was reminded that Touch of Evil has no opening credits, but that when it was first released it had been butchered by the studio and had credits during the, as noted, great opening sequence. This is the version I'd always seen. It wasn't until the great editor, Walter Murch restored it using Welles notes in 1998 that we could truly appreciate Welles' vision. I saw this in the theatre at that time I was in heaven. If only the same thing could be done with The Magnificent Ambersons, but alas the components do not exist.