I'm with you on the first two. Movies, especially bad movies, public domain movies, old movies, the stuff that usually ends up on MST3K, always have interesting and often inter-related histories (like Ed Wood stealing the octopus in "Bride of the Monster" but not the motor, or the same costume being used as the God That Gives Death With Its Touch in "Teenage Caveman" and the alien in Night of the Blood Beast)
Subtitles are very helpful, especially with the varying volumes.