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Cain shaves with a straight razor (not correctly) in Tin Man (the wizard of oz remake)

in Repo! The Genetic Opera

the lead character Shiloh plays with a straight razor in her room. BONUS: i zoomed way in, and it's a Double Arrow!

in the cartoon Futurama, straight razors are used on more than one occasion, albeit only by the old characters.

in "That's Lobstertainment" Harold Zoid (Zoidberg's uncle) uses a razor in a...

in The Great Race by blake edwards, tony curtis shaves with a straight, does all the lathering and everything, then actually shaves. I'm guessing he's old enough that it could have been real. the...