The fact that your spell-checker didn't pick up on "Shurlock" is odd, as mine did, but I guess no computer is perfect. I never read/watched Silence of the Lambs, although it is on my list.
You're right about observation. It's not an INTP "thing". I happen to be observant because I just can't help it, but I'm still an INTP. Since I was a little kid, I would edit my father's newsletters and bulletins, and my mother started paying me to edit her support letters from the ambulance corps she's affiliated with since I was 9. Since a few years ago, I was sure I was an ISTJ/P because of this, as well as because I also learn everything I can about a subject of interest, but I pretty much ignore everything else (which people seem to find funny, for some reason). However, I prefer abstract thinking to concrete thinking and am not very present-oriented, so INTP. I'd argue the same for Sherlock, for the same reasons, as well as because of John being an S-type and Sherlock's supposed to be more imaginative than him. Without John, though, I'd agree with you on ISTP.
As for Poe, I am pretty sure I read that he died from some sort of alcohol poisoning, but your details are quite interesting. I'll have to look that up some more. I also didn't know that he wrote dark literature for the money, although I did know that he was not financially well-off. Fascinating man.
SW