How to check for corrupted downloaded manga images

Use fileseek or similar program to search things by size e.g under 50kb or 100kb, and then copy all of those files to a new directory, view the thumbnail in windows explorer and then check manually for any broken files.

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Text missing from pdf made using Adobe Illustrator

Make sure to remove overprint from your text.

Select the text and then use Attributes panel (show it in window menu)
Untick the overprint option.

If you don’t know what text is in overprint
Open the AI file in Acrobat Pro and turn on Output Preview.
There you can show overprints. Switch back to Illustrator and fix.