If there are two things Better Call Saul loves, it’s tiny, blink-and-you-miss-it details, and bringing back characters from Breaking Bad in subtle ways.
First off, it would make total sense for Hank to be present at the bust, and we have no reason to believe he wasn’t working at the agency at the time Better Call Saul is set.
None other than ASAC Hank Schrader.
Second, it would have been very easy for actor Dean Norris to make the cameo, as his line would have been ADR added remotely in post.