Solution

 ACROSS

  1 Flat-topped hills

  6 1942 Disney deer

 11 Uber alternative

 14 Heeded the alarm

 15 Wrench variety

 16 1 or 11, in blackjack

 17 Tarzan's report on sinkhole damage?

 19 Seashell seller of note

 20 Speck in the Caribbean

 21 Honorary poem

 22 One needing keys to break in

 24 Factory-fresh

 26 Dust arachnid

 27 Tarzan's recap of a typical baseball game?

 34 "I get that a ___"

 35 "Darling"

 36 Pound of poems

 37 Cyclops' I's

 39 Money on the poker table

 40 Star-shaped bloomer

 41 Slopes sliders

 42 "Octopuses" or "octopi"

 44 Slick swimmer

 45 Tarzan's review of an exceptional new film?

 48 Bills featuring Washington

 49 "Trip" singer Ella

 50 Flats' counterparts

 53 Long, long ___

 55 Spare tire stuff

 59 Floppy beagle part

 60 Tarzan's reaction to an acceptable book-borrowing place?

 63 Thing to pick

 64 New Mexico senator Tom

 65 Hartford-based insurer

 66 JAMA readers

 67 City known for its salami style

 68 Make a case

DOWN

  1 Half portion at a luau?

  2 Son of Aphrodite

  3 Aretha Franklin genre

  4 Say OK

  5 Catch a glimpse of

  6 Shakespeare, notably

  7 Medicinal succulent

  8 January honoree, briefly

  9 Honeycomb locale

 10 Like a baby's grasp reflex

 11 Wine barrel

 12 Tummy trouble

 13 Head-y beverage

 18 Jim who dueled with a knife

 23 Dwarf planet between Mars and Jupiter

 25 Terminal guesses, briefly

 26 ___ d'hotel

 27 First in a literary series

 28 Story that often has cobwebs

 29 City known for its pizza style

 30 You may join one on Facebook

 31 Early Mexican

 32 "Meet" companion

 33 Crawley's title on "Downton Abbey"

 34 Speech therapy target

 38 Last name of fur fame

 40 Bravo preceder

 42 Act as chairperson, say

 43 Knight wear

 46 Go off the grid

 47 Tower with a replica in Las Vegas

 50 Texter's button

 51 It may have a part

 52 Martial ___

 53 Woody Guthrie's son

 54 Big do

 56 Miller bottle word

 57 Princess of Arendelle, in "Frozen"

 58 Bit of sweat

 61 Make off-limits

 62 Toy dog's bark

Solution