| Clue | Source | Date |
|---|---|---|
| Celebrity on an NBC skit program, e.g. | ||
| George Carlin became the first one in '75 | Universal | 10 Aug 2021 |
| Alec Baldwin, on more than 15 occasions | New York Times | 07 Apr 2021 |
| Guest star of an NBC comedy show | Universal | 10 Oct 2020 |
| George Carlin was the first, briefly | The Washington Post | 19 May 2018 |
| George Carlin was the first, briefly | LA Times Daily | 19 May 2018 |
| George Carlin was the first, briefly |