A tacky delight from 1987 are the vexilloids in Masters of the Universe - The Live Action Motion Picture. A colourful cheesy fun film for kids, that somehow got its own big budget movie. Although He-Man had a sword, Skeletor has a Ram's Staff of Power.
Large Skeletor Banners are hanging from Castle Greyskull on either side. They are coloured mostly purple and black.
Long yellow vexilloids are seen hanging from a doorway. The purpose is never explained but they have original movie made alien writing upon them.
Here is the best picture of a proper flag, that is barely visible in the background of some wreckage of some sort.