Well if you want to see a film Thai Cinemas - big screens in shopping ventres - mostly show English movies with Thai subtitles.
Booking is easy as staff are young and can speak some English generally.
Watch out for the "The King is so great, caring, nice superman" short film before every film. You are supposed to stand in respect! Talk about brain washing!
I love to go to the movies in Thailand, it is cheap and there are very good theatres and the latest movies. They also have asian movies with english subtitles (ask first!)
There are quite a few of these great theatres around. They are on the 7th floor of MBK-shopping mall, in Siam Discovery Centre and Siam Square.
Remember to stand up when the National Anthem starts to play after the comercials.