Comments aren't displayed with public_projects_only set to true
There's a quirk of Gitlab's API - whether an issue is public or not, it requires authentication to retrieve comments.
When public_projects_only is enabled we drop privileges - unfortunately this also means that we'll not be able to retrieve comments.
In a later release things might be adjusted so that auth is used for comments, but it needs a bit of care and consideration first.
Smart Commit notifications don't appear in issues
If you've done a commit with a commit message like
Fixes websites/Gitlab-Issue-Listing-Script#41
Then gitlab will close the issue and show a smart commit notification in the issue
However, GILS is unable to display these messages (ordinary commit messages are fine).
This is another quirk of Gitlab's API (websites/Gitlab-Issue-Listing-Script#42) - the API does not expose these notes, so GILS is unable to include them