You can't just play the B&W scenes by themselves. You need to add them to a Playlist first. Choose either Frankenstein or Casablanca and instead of hitting the
(More) instead. Once there, a menu of options will pop up. Choose ADD TO PLAYLIST. You will now see a small window appear on the bottom right corner of the screen. This is your "Playlist." Do this five times with any combination of the two movies (or do the same movie 5x) and then hit the
button and then simply play the scenes like normal.
Both of these movies ALSO have individual trophies for getting 5 out of 5 Stars, so you can get 3 trophies in one fell swoop.