In the opening scene at the Freiberg airport, we are given this subjective shot of the exit, whose double glass doors precisely mirror the double-doored art gallery entrance where Tony Musante is trapped to witness the attempted murder that sets BIRD in motion. Since this scene was not actually shot at a real airport, it is quite possible that this exit was literally composed of the same set components as were used in the earlier film.
Another celebrated SUSPIRIA moment among the eagle-eyed is this almost subliminal image, from Suzy's point of view, as her taxi drives her through the Black Forest. As a flash of lightning casts unbidden shadows, we see what appears to be a maniacal hand wielding a wicked blade.
I've always considered this flash -- which exists outside the main narrative but serves to make the night appear full of unimaginable horrors -- to be one of the movie's moments of real genius. It looks so spontaneous but it must have been extremely well planned. But again, while revisiting SUSPIRIA recently after I don't know how many viewings, I happened to catch another subliminal during the taxi sequence -- possibly unintentional -- for the first time.
Right after Suzy presses a piece of paper bearing the address of the Tanz Akademie to the glass separating her from the taxi driver (Fulvio Mingozzi) -- another glass barrier! -- there is yet another flash of lightning, revealing yet another subliminal. What? Didn't catch it? Here, have a closer look...
Yes, that's a reflection of Dario Argento himself, evidently directing the scene from the back seat of the taxi! To the best of my knowledge, no one else has previously documented this hidden image (if so, I'll happily credit them) and it's a particular delight to discover after all this time. It makes me wonder how much still remains to be unearthed from the endlessly rich textures and scenics of SUSPIRIA -- buried references to all of Argento's previous features, perhaps?
I can cite two other examples right away. If something seems familiar about Albert (Jacopo Mariani), the malevolently grinning child in the background of this shot, it is because Master Mariani wore the same, or very similar, shoes and socks when he previously stepped into frame at the end of the startling pre-credits scene of DEEP RED [Profondo rosso, 1975]. My thanks to Thomas Rostock for confirming this in his note below. And isn't Daniel (Flavio Bucci), the school's blind piano teacher, an echo of Karl Malden's Franco Arno in THE CAT O' NINE TAILS [Il gatto a nove code, 1971]?
I don't pretend to have all the answers, but I suspect this film still has much left to reveal.