JUST ONE NUMBER MAKES A BIG DIFFERENCE

Where changing just one number changes our entire perception of a famous number
  1. "Come in! We're Open 24-6!"
  2. R3-D2
  3. 2002: A Space Odyssey
  4. Nineteen Eighty Five
  5. 912
  6. C-4PO
  7. Beverly Hills 90211
  8. 9 1/3 Weeks
  9. The 11 Commandments
  10. 1-2-4-Go!
  11. 1 fish, 5 fish, red fish, blue fish
  12. July 4, 1775
  13. December 6, 1941
  14. The Chosen Two
  15. Ocean's 10
  16. The Twice and Future King
  17. December 26th
  18. 667
  19. 1493
  20. Four Men and a Baby
  21. One Dark Thirty
  22. Catch-23
  23. Two Flew Over the Cuckoo's Nest
  24. Crazy Nines
  25. Seven Brides For Six Brothers
  26. 9/10/2001
  27. 299
  28. Spartans at Thermopylae
  29. 4 strikes and you're out
  30. Four score and six years ago
  31. 99 Years of Solitude
  32. Around the World in 79 Days
  33. 19,999 Leagues Under the Sea
  34. Top 11 list
  35. The 13 days of Christmas
  36. 13 Angry Men
  37. Apollo 10
  38. A2 Steak Sauce
  39. 20 Jump Street
  40. Nine is Enough
  41. 36-24-56
  42. Slaughterhouse-Six
  43. A Tale of Three Cities
  44. The 38 Steps
  45. 99.6 degrees Fahrenheit
  46. Fahrenheit 452
  47. 85 Charing Cross Road
  48. 33 degrees Fahrenheit
  49. I'M THE NUMBER 2!
    Suggested by   @gwcoffey