Demi Moore "uses" a black handled adjustable in The Seventh Sign. She doesn't actually shave with it, but it is very visible, even the TTO action.
I have to correct Lereas' post: Captain Vidal (who shaves with a straight) in Pan's Labyrinth had his face slashed by Ofelia with the knife she kept on her.
In Predator one of Arnie's team head shaves with a DE( no lather !). In one of the Star Trek NG movies Troi shaves Riker while in the bath with a straight .
In the old UK TV series Jeeves and Wooster, Hugh Laurie ( aka Dr House) uses a SE (Gem 1912 ?).
Starsky and Hutch with Owen Wilson and Ben Stiller has one, possibly both of them (I can't recall off hand) using a black handle Super Speed.
The Natural has a shaving seen with Red and Pop shaving. I think one is using a straight. (Can't recall that one either)
The Wall has a ball end tech, I'm thinking it's the travel size. I know Pink uses the blade, but possibly not the razor itself. (I really need to find the time for more movies)
There's at least one D/E of some sort in Biloxi Blues. I think you can make out a bottle of AV as well.
The Untouchables Al Capone getting the straight shave.
There was an old Clint Eastwood spagetti western, he's getting a shave and the bad guys go to ambush him, he shoots first of course. Think it might have been Hang em High
Simpsons The one where they go to the 1895 reality show, They don't show Homer shaving with a straight just the aftermath!!
One of my favorite episodes of Leave it to Beaver had both DE shaving (a super speed, I believe), and a barbershope straight shave: