Puzzle

 ACROSS

  1 Talent show parts

  5 Involuntary movement

 10 "Do Us a Flavor" chip brand

 14 Move suddenly

 15 Trendy "caveman" diet

 16 Food, in a food fight

 17 Cookie with a Golden variety

 18 Lifesaving donation, perhaps

 19 Humane org.

 20 36-Down are here

 23 Indy 500 segment

 24 Object held sacred

 25 Word before a maiden name

 26 Deep void

 28 Car floor cover

 30 Superstar singer

 32 36-Down are here

 37 Settle in and get comfy

 41 ___ 51

 42 Audibly

 44 You might keep them on someone

 45 More secretive

 47 36-Down are here

 49 Signals assent

 51 "Narcos" agcy.

 52 Fourth prime number

 55 A little lamb may follow her

 57 Follower of Haile Selassie

 62 The old college ___

 63 36-Down are here

 66 Word after "military" or "family"

 68 Closely clustered

 69 Destiny

 70 Sup in style

 71 Info gathered by spies

 72 Skin care brand

 73 Nintendo competitor

 74 ___ spray (drugstore purchase)

 75 Tear apart

DOWN

  1 Accept as one's own

  2 Monte ___

  3 Pick up the check

  4 Emma of "The Favourite"

  5 Common Dalmatian name

  6 The "P" in PG

  7 Rootless aquatic plants

  8 Quickly heated the outside of

  9 Neighbor of N.D.

 10 ___ Vegas Aces

 11 More than sufficiently

 12 Sports centers, for short

 13 Bars that produce suds

 21 One may be Primetime or Daytime

 22 Possess

 27 Keep moist, as a turkey

 29 21-Down, e.g.

 31 Type of film at Sundance

 32 Apple product

 33 401(k) alternative

 34 Get a ___ up

 35 Clinton running mate

 36 Person reading this clue

 38 Road surface

 39 Counterparts to kgs

 40 Suffix in many language names

 43 Like a coral reef

 46 Long periods

 48 Differ

 50 "Hands to Myself" singer Gomez

 52 Hot guys

 53 Bert's buddy

 54 Competing (for)

 56 Desires

 58 First two parts of AFAIK

 59 Fend (off)

 60 Wyoming's ___ Range

 61 Formally change

 64 Anthony Hopkins' role in "Thor"

 65 Organizer's pile next to "Keep," perhaps

 67 It might be unsweetened

Solution