Boy, I really enjoyed this one. It's perfect for New Englanders, who tend to drop Rs where they do appear, and add them where they don't. We don't do this personally, but we hear it an awful lot. Anyway, all the theme stuff made me chuckle. Maybe FRANKZAPPER (24A: Microwave for hot dogs?) (the answers made me chuckle more than the clues) is my favorite, but I am, of course, partial to CONGERLINES (17A: Libretto for "Eel Trovatore"?) (ok, that clue is awesome), because it references our favorite crossword word, EEL.
The other two long answers, WHATALAUGH (29D: "That is SO stupid!") and FOAMPEANUT (17D: Bit of packaging detritus) are both excellent, and, really, so is a lot of the rest of the fill. TRIPE (12D: Horsefeathers) is a great word, VISTAS (10D: Prospects) is nice, SPARTAN (48A: Lacking the traditional comforts) (a friend has long referred to our house as "Sparta") is lovely, and ABJECT (1A: Showing hopelessness) is a fine start.
It is odd to see ROADEO (14A: Truckers' contest) again so soon, and there are a few other minor annoyances, but overall, I thought this was very nicely done. And is it just me, or did it feel a little harder than Wednesdays sometimes do? Maybe it's a function of having two constructors working on the puzzle, but I really felt out of sync with some of this as I was doing it. Not that there's anything wrong with that.
There's much more I could call out, but I think you get the idea. I thought it was a very good Wednesday.