- 20A: "Just what we need!" ("THAT'S THE TICKET!").
- 38A: "Thanks, but none for me" ("I'LL HAVE TO PASS").
- 57A: "Furthermore ..." ("BY THE SAME TOKEN …").
There isn't really anything that looks like it needs to be explained, so I'm kind of at a loss here. I tell you what. The phrase IN PUBLIC (38D: For all to see) always reminds me of a story Ron White tells that's pretty funny. So if you have a few minutes, take a listen to this. Then let me know in the comments what you think is noteworthy about this puzzle.
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Everything Else — 1A: Rarely read e-mail (SPAM); 5A: Edible pockets (PITAS); 10A: Bottled model (SHIP); 14A: Contemporary of Ella and Sarah (LENA); 15A: Make up (for) (ATONE); 16A: Verne skipper (NEMO); 17A: Hardwood trees (OAKS); 18A: "Buzz off!" ("SCRAM!"); 19A: Extremely dry (ARID); 23A: "Love __ Madly": Doors hit (HER); 24A: Caustic substance (LYE); 25A: Stately (REGAL); 29A: Fraidy-cat (SISSY); 33A: Extra NHL periods (OTS); 34A: Approximate fig. (EST.); 36A: "Uh-uh" ("NAH"); 37A: Follow the advice of (HEED); 42A: Irksome swarm member (GNAT); 43A: Place to apply gloss (LIP); 44A: Elephant's floppy feature (EAR); 45A: Mil. base enforcers (MPS); 46A: Shrubby landscape (HEATH); 48A: Like Dylan Thomas, by birth (WELSH); 52A: Sweetie pie (CUTIE); 54A: NAFTA signatory (USA); 56A: "Sands of __ Jima": 1949 film (IWO); 62A: Stein fillers (ALES); 63A: Find the answer to, as an equation (SOLVE); 64A: High point (PEAK); 65A: "The King and I" setting (SIAM); 66A: Engaged in, as a trade (PLIED); 67A: Dog of old mysteries (ASTA); 68A: 220-by-198-foot plot, e.g. (ACRE); 69A: Classroom jottings (NOTES); 70A: In need of a map (LOST); 1D: Slow-moving leaf eaters (SLOTHS); 2D: Pheasant female (PEAHEN); 3D: Turkish capital (ANKARA); 4D: One of a yawl's pair (MAST); 5D: Pale (PASTY); 6D: Rash reactions? (ITCHES); 7D: Verbally attacked, with "into" (TORE); 8D: Medical school subj. (ANAT.); 9D: Rig on the road (SEMI); 10D: Boa or cobra (SNAKE); 12D: Copies (IMITATES); 13D: Pea's place (POD); 21D: Partly melted snow (SLUSH); 22D: Have a bawl (CRY); 26D: Source of a hippie's high, perhaps (LSD); 28D: Sensed (FELT); 30D: All thumbs (INEPT); 31D: Took a load off (SAT); 32D: Pump or clog (SHOE); 35D: Tall story (TALE); 37D: Fabled runner-up (HARE); 39D: During 2009 (LAST YEAR); 40D: Itinerary word (VIA); 41D: Play with, kitten-style (PAW AT); 42D: Yukon automaker (GMC); 46D: Sly chuckle sound (HEH); 49D: In this way (LIKE SO); 50D: Workout wear (SWEATS); 51D: Greet with a beep (HONK AT); 53D: "Who's there?" response (IT'S ME); 55D: Watermelon discards (SEEDS); 58D: Channel for jocks (ESPN); 59D: New pilot's milestone (SOLO); 60D: Touched down (ALIT); 61D: Play-of-color gem (OPAL); 62D: Quick-wink link (AS A).