Happy Festivus!

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Across
  1. 3. 3600 seconds (4 letters)
  2. 8. Name of Grant Wood’s most famous painting: ________ Gothic (8 letters)
  3. 12. The written text of a play, movie, or broadcast (6 letters)
  4. 13. DC superhero Barry Allen’s nickname The _____ (5 letters)
  5. 14. Organ responsible for blood flow (5 letters)
  6. 16. Alliterative term for a person who intentionally causes trouble (12 letters)
  7. 20. 2019 HBO series starring Amy Adams (12 letters)
  8. 21. Irreversible (9 letters)
  9. 24. Claw belonging to a bird of prey (5 letters)
  10. 26. Type of party planned without the guest of honor’s knowledge (8 letters)
  11. 28. Fish commonly found in ponds (3 letters)
  12. 30. Brain protector (5 letters)
  13. 32. Pertaining to an indigenous community (6 letters)
  14. 33. Earthly form The Devil took to tempt Eve in the Garden of Eden (5 letters)
  15. 34. Type of pigment used with a quill (3 letters)
  16. 35. Shorter than a sword (6 letters)
  17. 36. Required to visit the doctor’s office (11 letters)
  18. 39. Process of adding value to create the illusion of form, space, or shadow (7 letters)
Down
  1. 1. 4th sign of the zodiac (6 letters)
  2. 2. Body part containing the ulna and the radius (7 letters)
  3. 4. One of your digits (6 letters)
  4. 5. Condition of surgical tools (7 letters)
  5. 6. Well known petroleum product (8 letters)
  6. 7. Made from tree pulp (5 letters)
  7. 9. Surname of The Hulk (6 letters)
  8. 10. Ancient Scottish or Irish style (6 letters)
  9. 11. Middle layer of skin (6 letters)
  10. 15. A building used to house criminals for punishment (6 letters)
  11. 17. Pleasant looking reproductive structure of some plants (6 letters)
  12. 18. Character frequently killed on South Park (5 letters)
  13. 19. Trouble making a choice (10 letters)
  14. 22. Canines (4 letters)
  15. 23. Burning astronomical object (4 letters)
  16. 25. California mascot (4 letters)
  17. 27. Salt’s counterpart (6 letters)
  18. 29. Floating mass visible in sky (5 letters)
  19. 31. Customary (11 letters)
  20. 37. Type of leaf on a Christmas Tree (6 letters)
  21. 38. Gift you’re getting today (6 letters)