After almost forty years, I've finally managed to see all the films listed in Monsters of the Movies. I've been tracking my progress in a spreadsheet and a letterboxd list and over the last few months, I've been slowly filling my gaps by downloading the films from archive.org or watching the films online. The exception was Mad Love (1935), which I had to get through Amazon as a Spanish-subtitled DVD and then watch with the subtitles turned off!
Amongst the recently-watched films, the two stand-out gems for me were The Manster (1959) a.k.a. The Split: