Question: Should I watch the entirety of Breaking Bad before I watch Better Call Saul?
Answer: Now that it's ended, this question can be fully answered. Better Call Saul includes events after the conclusion of Breaking Bad, as well as references to and descriptions of major events from the latter. Not only would Breaking Bad be spoiled for you by watching Better Call Saul first, but there's a lot that wouldn't be understood.
Chosen answer: So far the show has been about Saul's struggles as a lawyer long before the Breaking Bad timeline (Spoiler Alert: It starts out for the most part at a time when he didn't even go by the name Saul).
Question: How did they put the little bulldozer under the factory, when there's no elevator built yet?
Answer: The bulldozer could be disassembled, the individual pieces carried down, and then reassembled once underground.
Question: I know Bob Odenkirk wore a hairpiece in this series, but does Saul Goodman himself wear one, or is it his natural hair? I seem to recall some episodes of Breaking Bad in which you could see a bald spot in the crown area of Saul's head, so if he is wearing a hairpiece, it seems a little odd that he would have an uncovered bald spot, not to mention the flash-forward segments of this show saw him with quite the thinning head of hair despite not taking too long after Breaking Bad.
Chosen answer: He does a "comb-over", which is a really tacky way of covering a bald patch: letting the hair grow long on one side, then combing it to the other side, over the bald spot. We see him arranging it at the end of S06E09, after the time jump. It's pretty on-brand for Saul. Later, when he becomes Gene, he cuts his hair more "normally" and his baldness is more apparent throughout the scenes in that timeline.
Question: When the house is being cleared out, there's a scene in the closet and as the camera is panning around, there's a ball cap sitting on a box with a logo I can't recognize or make out. Does anyone know what the logo is and if it came from an earlier episode or a "Breaking Bad" one?
Answer: It might be the Panavision cap he wore when directing his terrible commercials.
Answer: It is my opinion that you should absolutely watch Breaking Bad first. If you did not know, Better Call Saul takes place before the events of Breaking Bad. At the time I am posting this, BCS is mid-way through season 5, with season 6 on the way perhaps in a year. So if you binge Better Call Saul now, you would not be able to "flow" right into Breaking Bad. To me, it's better to watch in the order that they came out. Breaking Bad was a phenomenal show, and now watching Better Call Saul, it is fun to watch the events unfold and start to lead up to what we saw in BB. Enjoy.