Not my favorite Monday puzzle. Didn't love the theme. Seemed awfully contrived, and in MOORESSMORES, the vowel sound changes, at least in my dialect. Add to that complaint OVI (39A: Prefix with duct) (yeah, that's an everyday, Monday-type word, right?), EROSE (22A: Jagged, as a leaf's edge) (well, ok, I know that word, but it might just be from crosswords... I can no longer be sure), and AARE (57A: Bern's river) (definitely from crosswords), and, psst!, you've got kind of a weak puzzle.
25D: Direction in which the sun sets? Why not just clue this with 25D: Write W-E-S-T into these four boxes? Influenced, perhaps, by recent sporting events, I was almost tricked by 50D: Augusta's home, but when Georgia didn't fit, MAINE was easy enough.
In looking for other things to write about, I kept imagining other possible ways to clue certain things. Like 52D: ___ ___ half instead of 52D: Admitted at the door, and 53D: Obnoxious recurring character played by Chris Kattan on SNL for 53D: Tropical fruit. And, of course, 67A: Montoya who said: "You killed my father, prepare to die" instead of 67A: Architect Jones.
But let's end on a happy note, shall we? My favorite answer today: IKIDYOUNOT (29D: "No, seriously"). I kid you not.