The cinematography is a big reason this film worked...
...or, at least, worked as well as it did.
Joseph Biroc was a master of B&W mood cinematography, and had just filmed HUSH HUSH SWEET CHARLOTTE (and receiving an Oscar nom for that) before shooting I SAW WHAT YOU DID.
Biroc could give even William Castle movies a creepy dignity, as he did with 13 GHOSTS.
I can only imagine how much better STRAIT-JACKET might have been had Biroc photographed that one...
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Non-sequiturs are delicious.