Did Everett and Penny ever get back together again? Or did Penny do her stupid "count-to-three" act and refuse to marry him without the original ring?
Ungrateful? What does she have to be grateful for? It seems like Everett, while good-hearted, was a lot of talk with not a lot of acting on any of his promises, and then he got himself thrown in jail for practicing law without a license, and when he saw her again he was planning to do the exact same thing again with a dentist's practice. It's perfectly understandable that she would want to trade him in for someone more trustworthy. ... But to answer your question, I assume she must have eventually, because Penelope in the original myth believed Odysseus' return and accepted him.
Grateful that he'd have her. And the other guy's trustworthiness is clearly less attractive to her than his money.
Why was it so unbelievable to Everett that Pete was working on a chain gang ("Heat must be getting to me!")? Did he view is it extremely unlikely that he'd see Pete in that circumstance? Or did he, like Delmar, accept that Pete was indeed turned into a toad and crushed by Big Dan?
He believed Pete was dead, or at least had run off.
How did Homer Stokes know that Tommy had sold his soul to the devil? If I remember right, Vernon T. Waldrip whispered something right before the announcement, as if Vernon somehow knew it. The question is, how did ANYONE (aside from the three heroes) know about that? Is this a reference to the actual musician on which Tommy was based? As in, perhaps Tommy was sufficiently well-known and talked-about that his deal with the devil was a common rumor? If so, that rumor spread awfully quickly.
Stokes was a Klansman who was in the middle of running for Governor (and was in the process of kicking or paddling Pappy O'Daniel's butt, depending on who you ask). It's entirely possible that Stokes made his own deal with the devil, and offering up Tommy was a way for the Devil to "pay."
When they're recording the song at WEZY, Everett says "Hot damn, son, I believe you did sell your soul to the devil", right after they finish the song. One assumes it's still being recorded, and was later broadcast, or at least someone may have heard it at some point.