GQ currently have a neat article online: 'An Oral History of the Rise and Fall (and Rise) of 'The Dana Carvey Show.'" It's really long.
Charlie was a writer on the short-lived sketch show, working alongside (to quote GQ) "Robert Smigel, Louis C.K., Stephen Colbert, Steve Carell, Spike Feresten, 30 Rock showrunner Robert Carlock, Delocated star Jon Glaser, and Community writer and supporting player Dino Stamatopoulos." The piece is divided into sections, one of which features the Carvey staff talking about Charlie. Here's a snippet:
Tucked away in his office, mostly keeping to himself, was a writer named Charlie Kaufman—a writer who would go on to write and direct some of the most surreal films of the last decade.
Smigel: His writing submission was not fantastic. He had written on a show called The Edge, which was a not very successful Fox sketch show that I know he was disappointed in for not taking enough chances. His submission packet was up and down, but kind of interesting. There was one sketch that was a very meta treatment of Unsolved Mysteries and it was one of the most brilliant sketches I had ever read, and it was enough for me to hire him.
Chott: He definitely kept to himself, but he would always have the funniest stuff at the table reads. He would always have this stuff that was really far out there. (Source)
If you don't read the whole article, the Kaufman section is definitely worth checking out. (It starts near the bottom of page 5.) They also mention the "Weirder Al" sketch that he wrote, which BCK posted about a while ago.
