Puzzle

 ACROSS

  1 Moments of revelation

  5 Zone

  9 Xerox competitor

 14 "Isn't that something!"

 15 Radio alphabet end

 16 Fuming

 17 State by Lake Erie

 18 Prepares for lithography

 19 Conduit from the heart

 20 Use as a starting point

 22 Trojan War figure with a loud voice

 24 Rather challenging

 27 One of four at an MLB game

 30 Facing reality again, literally? (Hint: Enter this answer "back"ward!)

 35 Woodpile covering

 37 Yes, in anime

 38 Vikings' tongue

 39 Shoe bottom

 41 Erving's court moniker

 43 Best possible

 44 "Old MacDonald" refrain

 45 "Agnus ___"

 47 Long tale

 48 Give no way out, literally? (enter "back"ward)

 52 Set of answers

 53 Exacts revenge

 55 Famous print maker?

 59 Lawn trimming tools (Bonus diagonal clue: Extra power source, literally? [enter from this answer's 3rd letter to 20-Across' 4th letter])

 63 Like Huawei and Samsung

 64 Not quite closed

 67 "Hurry!"

 68 Lunch box in Kobe

 69 Taxis

 70 Othello's false friend

 71 Rising ingredient

 72 Pants patch place

 73 Boot out

DOWN

  1 Wide-eyed

  2 Santa laugh syllables

  3 "In your dreams!"

  4 ___-sheeting (bed prank)

  5 Astronomy angle

  6 Seek office

  7 Antlered animal

  8 Down Under dweller

  9 Still uncertain, literally? (enter "up"ward)

 10 Smooth with heat

 11 Haul (off)

 12 Name that sounds like a car

 13 Learn through the grapevine

 21 "I'm impressed!"

 23 Chinese menu general

 25 New B.A. or B.S.

 26 Salon styles

 27 Speak

 28 Organizer Kondo

 29 Primp

 31 Assents silently

 32 Cause, as havoc

 33 "August: ___ County"

 34 Airport frustration

 36 Two queens, e.g.

 40 Causing mischief, literally? (enter "up"ward)

 42 Dancer's jump

 46 Opposite

 49 Top of the corp. ladder

 50 Lash out at

 51 Unofficial bomb: Abbr.

 54 Crime writer Marsh

 55 Miniature carrot size

 56 "So that's how it is"

 57 Rodriguez of "Jane the Virgin"

 58 Some are saturated

 60 Isaac's eldest

 61 Teases a lot

 62 Place in line

 65 Resolution-forming mo.

 66 Honest ___

Solution