There's no specific confirmation that Hank met Saul before, but Hank is a DEA agent and Saul is a lawyer in his jurisdiction, so it would not contradict anything if Hank showed up.
I'm pretty sure Hank just knew Saul from the commercials.
I, like the others here, really loved this episode. To be honest, if it weren't for
Breaking Bad, I don't know if I would have stuck with this show as long as I did, but with "Five-O," it showed it has the potential to be a great show.
They really had me with the beginning parts, as I thought, maybe, Kaylee was Mike's partner's daughter and not his own granddaughter. Maybe I missed something in
Breaking Bad that would prove me wrong, but I couldn't tell where they were going with the beginning part as it took a long time for them to reveal that Matty was Mike's son. Mike being Mike, it would not have surprised me to find out that Kaylee was not his biological granddaughter, but rather, his (much younger) partner's daughter, to whom Mike felt duty bound to look out for. Hell, the way they write this show, being ambiguous, I was thinking for a moment there that Kaylee's mother was Mike's estranged daughter, who got upset at him for messing up his life and couldn't call him by "Dad," rather referring to him as "Mike."
Breaking Bad did this too, forcing you to pay attention as you were never sure what was going on, even when things seemed straight forward. I have to admit, I tend to watch TV with a device in my hand, giving partial attention to both, but shows like
Better Call Saul make me pay full attention, lest I miss something.