Isaac - Thanks for weighing in. I think N6524C was a DC-6B (see, for example,
Aircraft Data N6524C, 1952 Douglas DC-6B C/N 43524, Aerostar International Inc RAVEN S57-A C/N S57A3003). I used the image of N6524C in Post #637 to show that Ozu had cut in some b-roll footage of a non-B377 in the airport sequence. I was making a side-by-side comparison of the screen shot from the film (N88881) and a DC-6B (N6524C). At the time I posted it, I had not yet tracked down N88881.
Shortly thereafter, I found that N88881 was actually a DC-4A. As you say, all the four-engined DCs (unlike the B377) had a tail bumper.
All this stuff may be trivial (tedious) to most of our fellow Forum members, but I love to track down things like this.
Incidentally, in an off-Forum e-mail, John Dell tells me that he hopes to resume his WWII bomber (especially B-17) designs soon and that he and his late-wife Mary shared Lil and my love for the films of Ozu Yasujiro, one of which started me down this particular aviation history rabbit hole.
Cheers,
Don
PS: Graph 3 of my post (637) contains a typo. Ozu used footage of two (not 4) B377s in the sequence, plus the DC-4A.