This film, made quickly by the great master of b movies (Roger Corman) is a wonderful lesson for cinema today: with a few days of pre-production, much less filming and a competent group of collaborators you can do something that entertains and dignifies. From there we have movie glories (Karloff, horror film superstar), Nicholson (young but very confident and competent), an extraordinary director (Corman), a remarkable production assistant (Coppola) and so I can go on and on. Talent accomplishes masterful things with just a little budget, unlike today's filmmakers who exhibit atrocious incompetence. With very few actors this film keeps the eye on a story that has totally unexpected twists. When we see these kinds of movies, it's that we can realize that something bad is going on with today's movies.