News flash: There aren't a ton of roles for non-white actors in big budget studio movies. That's partially because even when those roles do exist -- in movies based on true stories about people who aren't white, or characters from other media who were originally black or Asian or Latina -- they're frequently still given to white actors.
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John Oliver makes that point pretty damningly in this clip from Sunday's edition of Last Week Tonight, which turns a harsh spotlight on everything from classic examples of whitewashing in film (Scarface, West Side Story) to recent examples like Gods of Egypt and Aloha.