Some nice anagram work in this one! Frannie's favorite was DORMITORY/DIRTYROOM, and mine might have been SNOOZEALARMS/ALASNOMOREZS, but really, they were all pretty good.
For clever anagrams and beautiful symmetry, we are willing to grant a lot of liberty, and that's just what we did today. ORNIS (71A: Local bird life)? Blecch. MFG (95A: One of the M's of 3M: Abbr.) Blah. 44D: "How can ___ sure?" (IBE). OK, whatever. And there were other little boring bits, but like I said, we put up with them without too much complaining, because there were plenty of good non-theme entries as well.
I liked seeing ABORC (crazy-looking!) (68D: Multiple-choice choices) in there, and we were totally prepared for 48A: Mayo containers? (ANOS) after last Saturday's puzzle (3/30 Important part of mayo). 37D: Georgia neighbor was especially vexing for a while, as ALABAMA and FLORIDA both fit, but it was finally ARMENIA (!) that had to go in. 1A: Postal ID (Idaho) was brilliant! And who doesn't love seeing GENITIVE (97D: Like the word "curiae" in "amicus curiae") in a puzzle? Ahhh... Latin.
Plenty of fun clues/answers + a solid theme = an enjoyable Sunday puzzle.