Its a good movie.
The prints on the taxi are interesting. Considering he was wearing gloves.
I find the spelling errors in the letters and the puzzles interesting.
It was also interesting the gloves at the scene, apparently they were smallish, could they have been a clue to another victim, he did claim many more victims and the police suspected him in other murders.
I suspect the spelling mistakes are deliberately placed. In his first cypher he uses the word paradice (sic) , the same spelling appears on the Halloween cards. Is he trying to draw attention to the word paradise. If memory serves me correctly the mt Diablo map has a paradise drive.
It’s a riddle, my guess is solve the riddles and you get the keys to the cyphers that reveal him.
But yet again I got nowhere so what would I know.