John Oliver probably didn’t see this coming. The “Last Week Tonight” host appeared last week on Bravo’s “Watch What Happens Live,” where host Andy Cohen asked him about his kids’ TV diet. Oliver mentioned that “Bluey” and “Phineas and Ferb” are currently in heavy rotation at his house.

“Phineas and Ferb,” he raved, was “actually genuinely funny,” with “some good jokes in that.” But both Cohen and Oliver strangely didn’t know where “Phineas” actually runs — even though it’s been a Disney Channel staple since 2008. The best that Oliver could come up with: “I don’t know… PBS?”

Ooh, those are fighting words. “Phineas and Ferb” creators Dan Povenmire and Jeff “Swampy” Marsh weren’t having it. So the duo and their writers — currently working on the “Phineas” revival, set to drop this summer on Disney Channel and Disney+ — are humorously clapping back.

In what hopefully is the start of a new,...