Nudges below:
The last square is a rebus designed to show you how the asterisk clues work. Letters are optional.
By now you should have five things. If youβre stuck, think outside the box, particularly the big box. 

Hopefully you found what you were looking for in the clues to lead you to a relevant 1976 movie. By the way, the puzzle title β12/26β is more than just a date placeholder.