Brian de Palma is often accused of taking someone else's original ideas for his films. In this film, the director didn't hide it much. The title itself already sends us back to Antonioni and his 'Blow up' (to be precise - 'Blow up') and with good reason: there the murder was recorded on photographic film, here, respectively, on the sound track. And this is not the only borrowing.
In general, the entire stylistics and even some of the scenes are taken from Argento's film Blood Red. But can we blame De Palma? Has the director really earned the title of 'plagiarist' with his work? De Palma created his own beautiful style by linking old film noire, Italian horror movies and more. Another uncomplicated 'plagiarist', Sergio Leone, did it in his time. In the end, both ended up with purely their own pictures, complete in style, visuals and plot.
Personally, I love the films of both. This one is no exception. So much for the spaghetti thriller. It's been a long time since they've made a film of this quality.