HBO is making the most of its “Leftovers.” Four days after ordering Damon Lindelof’s “Watchmen” adaptation to series, the premium network has picked up Tom Perrotta’s comedy pilot “Mrs. Fletcher” to series.

Starring Kathryn Hahn in the title role, “Mrs. Fletcher” is based on Perrotta’s 2017 New York Times’ bestseller of the same name. Nicole Holofcener, who directed the pilot, is also on board as an executive producer.

Here’s the official logline from HBO:

“Mrs. Fletcher” is a dual coming-of-age story, exploring the impact of internet porn and social media on the lives of an empty nest mother and her college freshman son.

The rest of the cast includes Jackson White, Casey Wilson, Owen Teague, and Jen Richards, all of whom are series regulars. Jessi Klein and Sarah Condon will also executive produce the half-hour comedy.

Perrotta served as the co-creator, co-showrunner, writer, and executive producer on...