It was pointed out to me that Erin Rhode had a similar (and excellent!) puzzle in AVCX last year, which I had completely forgotten about. Ah well. Link to Fiend review.
*"Get ___!" ("Stop obsessing about trivial things")
13A
Bit of sarcasm
15A
Piano student's exercise
16A
One of 100 members of Cong.
17A
En pointe, in ballet
18A
Cookies with a circumference of 5.5 inches
19A
"Schitt's Creek" creator/actor Levy
20A
*Communion bread
22A
The point of fine dining?
23A
End of a quaint business sign
25A
Any of 11 states in 1861
27A
16-Across, e.g.
28A
Orgs.
31A
*Young female cows
32A
Imitated
34A
Observes
37A
Anemic ... or a description of the answers to the starred clues
41A
Bake sale container
42A
Amtrak track
44A
*Basketball basket height
47A
Phrase on a thrift store tag
49A
Doc who does lab work?
50A
Having a cigarette out back, say
53A
Famed Manhattan deli
55A
Nutritional figs.
56A
*Excessive enthusiasm for late-70's R&B
59A
Ante-
60A
Chat, casually
61A
Exchange wedding bands without a wedding band
64A
"Days of ___ Lives" (soap opera with 14,000 episodes and counting)
65A
Biology rank between class and family
66A
Investigative journalist Farrow
67A
*Flora with fronds
68A
*Makes hard of hearing
69A
*Least
Verticali
1D
Gp. that plays at Tanglewood in the summer
2D
Cape ___, Massachusetts (not that one!)
3D
One who takes discussions in an annoying, boring or pointless direction
4D
Wilt (like that house plant you overwatered, or maybe forgot to water; but one or the other and it's definitely your fault)
5D
Cat call
6D
Other, in Acapulco
7D
They have regrets
8D
Get ___ of one's own medicine
9D
"___ Miserables"
10D
"Me too", formally
11D
Skinnier
12D
Pejorative for Earth, Mars and Luna in "The Expanse"
14D
Iodine-rich seaweeds
21D
Start of a quaint business sign
22D
Barely balance
23D
Resting place
24D
Pueblo people
26D
Spiced tea
29D
Type of dorm
30D
Vergara of "Modern Family"
33D
Olympic athletes testing positive for trimetazidine
35D
"Mwah!"
36D
Unstable person, slangily
38D
After dark, in adspeak
39D
"Force 10 From ___" (1978 movie sequel, which is a better film than the 1961 original according to me and no one else)
40D
Level
43D
Capts.' subordinates
44D
Lethargy
45D
Evasive football maneuver
46D
Cavs and Mavs, for two
48D
Thrifty person
51D
Crazy about
52D
"Yeah, in a way"
54D
Less than
57D
"Frozen" reindeer
58D
___ anglais (English horns, which are confusingly known by this french name in England, even though the instruments themselves are not French, English or, for that matter, horns)