Better Call Saul executive producer Melissa Bernstein explains why the surprise Breaking Bad cameos didn't adhere to the show's rules. First airing in 2015, Better Call Saul serves as a spinoff of Breaking Bad, following Bob Odenkirk's Jimmy McGill as he becomes sleazy criminal lawyer Saul Goodman. The show came to an end last year, with a final season that included welcome appearances by Bryan Cranston's Walter White and Aaron Paul's Jesse Pinkman.
https://screenrant.com/better-call-saul-breaking-bad-cameos-rule-break-producer/