The Sims Wiki:Todo/explained

Here you will find the tasks from the |To-do list in greater detail.

Dead-end pages
"The following pages do not link to other pages in The Sims Wiki." This list is usually empty, though sometimes new articles show up here. This can easily be fixed by adding links to other related articles, the game(s) where the subject of the article is from and so on. Many articles also contain infoboxes which usually have many links, though these are templates, which can be tricky for beginners.

Orphaned pages
"The following pages are not linked from or transcluded into other pages in The Sims Wiki." New articles often end up here as no other articles link to them. You can think of related articles and link the orphaned page in a "See also" section. We also have many Category:Lists, perhaps the orphaned page fits in on one of them.

Duplicate images
At the bottom of an image page it will show a link to a duplicate image, just above 'what links here' if the hash values of the images are the same. This means the images have to be completely identical, if someone changes just one pixel in an image and uploads it again, it will not be detected.

The Special:FileDuplicateSearch page leaves much to be desired since you can only search for the title of an image, which is silly since then you'd have to know beforehand that the image is a duplicate. There's a forum thread about how to more effectively search for duplicate images on Community Central.

Luckily there is a work-around. The Wikia API can be used to produce a list of all images where the duplicates are marked:

Just look for the indented  in the list. Regular users are limited to displaying 500 files at a time. To continue on "the next page" add  and then the last file on the list (without the File: prefix) eg.

If you have a bot account or if you are at least a sysop, the  can go up to 5,000.

currently has files. That's some pages to search for regular users, but only 2 pages for bots and admins.