How did Bandit get his personalized license plate so quickly?
It's probably fake, given that the whole point of the car is to catch the attention of police and then evade them. If he got a real one, the police could use it to track down his real identity.
Why that beer of all beers?
Disregarding the fact that Coors wasn't available in Georgia at the time and spoiled easily, they're still going through all this trouble for freaking Coors! Unless it's a case of Streisand Effect or they've changed their recipe since then, why would anyone want cheap beer this badly?!
My dad told me it was because, at some point, it was illegal to transport the beer from west of the Mississippi River. He didn't tell me the reason (as he didn't know) but, after I looked up why, the reason was because Coors was unpasteurized at the time (1977) and, since it had to be kept cold before people could drink it (for obvious reasons), it couldn't be sold in states east of Oklahoma unless there was some verification or permit (I'm not familiar with legalities of the time but I think it might've been because east had beer requirements that the west didn't).Since Coors couldn't verify that/get the necessary permits outside of their region, the beer couldn't be sold anywhere east of the Mississippi. Why would anyone want it? Forbidden Fruit maybe? Also, it wasn't any old Coors, it was Coors Banquet, specifically.
Big Enos and Little Enos are spending a huge amount of money on the bet versus the actual quality of the product. It's really just a refreshment for their party and they're getting something "illegal" (In the Poke the Poodle sense) just because they can. As we see with the end of the movie, they're now wanting the Bandit to do clam chowder from Boston in eighteen hours.
In states where it was officially unavailable, Coors in the 1970s had a cachet that is impossible for modern audiences to identify with. By obtaining such a vast quantity of it, the Burdetts are making a very big statement about their wealth and influence.
Aren't Bandit and Snowman committing burglary?
They break into the distributor's warehouse (which, conveniently, has no alarm) and take 400 cases causing some criminal damage along the way. Snowman does acknowledge that they "need to pay someone" for the beer, and Bandit says to leave a note for the bill to be sent to Big Enos Burdett, but Snowman throws his notebook away with the note only part-written. The distributor probably already had buyers for all that beer.
