| Clue | Source | Date |
|---|---|---|
| Sequel's subtitle, perhaps | ||
| Follow-up designation | Newsday | 19 Mar 2022 |
| Sequel | The New Yorker | 11 Mar 2019 |
| Sequel | Eugene Sheffer | 20 Jan 2017 |
| Sequel | New York Times | 16 Sep 2015 |
| "To be continued" installment | LA Times Daily | 24 Jun 2015 |
| "To be continued" installment | ||
| Sequel | ||
| Trilogy's middle section |