A while ago, I scraped the entirety of Dynasty Scans and found these pages to be broken:

[
  {
    "url": "/system/releases/000/012/794/GG_04.19_00.jpg",
    "idx": 0,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_01.png",
    "idx": 1,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_02.png",
    "idx": 2,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_03.png",
    "idx": 3,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_04.png",
    "idx": 4,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_05.png",
    "idx": 5,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_06.png",
    "idx": 6,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_07.png",
    "idx": 7,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_08.png",
    "idx": 8,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_09.png",
    "idx": 9,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_10.png",
    "idx": 10,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_11.png",
    "idx": 11,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_12.png",
    "idx": 12,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_13.png",
    "idx": 13,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_14.png",
    "idx": 14,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_15.png",
    "idx": 15,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_16.png",
    "idx": 16,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_17.png",
    "idx": 17,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_18.png",
    "idx": 18,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_19.png",
    "idx": 19,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_20.png",
    "idx": 20,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_21.png",
    "idx": 21,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_22.png",
    "idx": 22,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_23.png",
    "idx": 23,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_24.png",
    "idx": 24,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/012/794/GG_04.19_credit.png",
    "idx": 25,
    "chapter": "gakkou_gurashi_ch19_1"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_01.jpg",
    "idx": 8,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_02.jpg",
    "idx": 9,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_03.png",
    "idx": 10,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_04.png",
    "idx": 11,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_05.png",
    "idx": 12,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_06.png",
    "idx": 13,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_07.jpg",
    "idx": 14,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_08.png",
    "idx": 15,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_09.jpg",
    "idx": 16,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_10.jpg",
    "idx": 17,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_11.jpg",
    "idx": 18,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_12.jpg",
    "idx": 19,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/718/Lyrical_Nano!_(extras)_13.jpg",
    "idx": 20,
    "chapter": "the_proof_of_love_i_dedicate_to_you"
  },
  {
    "url": "/system/releases/000/003/400/1_Spica_v01_story01_07.jpg",
    "idx": 8,
    "chapter": "spica_ch01"
  },
  {
    "url": "/system/releases/000/002/192/NanohaComicALacarte.jpg",
    "idx": 0,
    "chapter": "mahou_shoujo_lyrical_nanoha_vivid_magical_cooking_from_comic_a_la_carte"
  },
  {
    "url": "/system/releases/000/002/181/1_credits.png",
    "idx": 34,
    "chapter": "love_cubic_ch03"
  },
  {
    "url": "/system/releases/000/003/830/106b_",
    "idx": 10,
    "chapter": "umisho_ch111"
  },
  {
    "url": "/system/releases/000/002/228/aishi_wo_tome-credits.jpg",
    "idx": 16,
    "chapter": "itoshi_wo_tome_dressing_up_extra"
  },
  {
    "url": "/system/releases/000/002/227/aishi_wo_tome-credits.jpg",
    "idx": 18,
    "chapter": "itoshi_wo_tome_ch08"
  },
  {
    "url": "/system/releases/000/002/225/aishi_wo_tome-credits.jpg",
    "idx": 16,
    "chapter": "itoshi_wo_tome_ch06"
  },
  {
    "url": "/system/releases/000/002/224/aishi_wo_tome-credits.jpg",
    "idx": 16,
    "chapter": "itoshi_wo_tome_ch05"
  },
  {
    "url": "/system/releases/000/003/771/Color%2055%20by%20Tot",
    "idx": 11,
    "chapter": "umisho_ch55"
  },
  {
    "url": "/system/releases/000/003/769/Color%20by%20Tot",
    "idx": 10,
    "chapter": "umisho_ch53"
  },
  {
    "url": "/system/releases/000/002/223/aishi_wo_tome-credits.jpg",
    "idx": 16,
    "chapter": "itoshi_wo_tome_ch04"
  },
  {
    "url": "/system/releases/000/001/182/img_0001.jpg",
    "idx": 0,
    "chapter": "miottemasu"
  },
  {
    "url": "/system/releases/000/000/340/1_164.png",
    "idx": 7,
    "chapter": "shikabane_hime_ch09"
  }
]

Pretty impressive honestly considering how many mangas are on the site.

Figured I'd drop it here in case uploaders/staff wanted to fix 'em :) (Although some of these are really old. Perhaps some of the original uploaders are no longer active.)