It’s been going on pretty much forever. For my books, I have to compile credits for films going back to 1915 and plays going back to the 1890s, and I find credits like “Second Wiseacre” and “Girl Outside Bank.”
I agree they should be used more often—as a former film extra, I like to see 'em credited!
—Eve, aka “Woman in AA Meeting” (“Polyester”), “Woman at Rally (“Wrong is Right”), “Audience Member” (“Deathtrap”), “Woman at Party” (Rollover”)