Vince Gilligan and Peter Gould like to include Easter Eggs in their shows for observant fans to find, and viewers enjoyed finding secret stuff on Breaking Bad so much Vince and Peter decided to keep the Eggs rolling in Better Call Saul. (Spoiler-ish material ahead)
For the second season of Saul they decided to go beyond the visual and play with words by including an anagram in the episode titles, so they put the puzzle in place and didn't give it a second thought.
But a fan named Shaquita discovered the Easter Egg faster than a tweeker on Blue Sky, posting her findings on Twitter with the caption “on vacation this week, and have nothing but time lol".
The creators confirmed Shaquita's findings and were blown away by how fast she found it:
“We had this—to us—this very bright idea of encoding the words “Fring’s Back” in the episode titles,” Gould told Vanity Fair. “And we thought we’d be revealing it maybe sometime over the summer. I guess we really underestimated the genius and hard work of our fans.”
“And their attention to detail, and God bless them for it,” Gilligan chimed in.
Gould concluded: “It’s hard to complain about people paying attention to every aspect of the show. It certainly reminds us again that we better keep all our i’s dotted and our t’s crossed in every aspect of the show.”