Is it possible to compare lists?

To clarify, it was also a pain making this ''still need to watch'' list, because I had to open all movies and then add them to the list. It would have been cool if I could have simply marked them from my ''favorite movies'' list, similar to how you mark them for the watchlist, perhaps an idea for the future?

@Navin2000 Yes, you can easily do this with Advanced Title Search at https://www.imdb.com/search/title/ -- scroll down to the "Your lists" section on the left and open that section, where you will see options to include / exclude lists from the results. In your case, type the list name you want to start with in the "Include" section and the list whose results you want to exclude in the "Exclude" section and then press the "See results" button at the top. You are welcome to add other constraints to the search, for example, to limit the results to only titles made after a certain year. You can also compare two lists and see which titles are in both lists by entering the titles of both lists in the "Include" section -- enter one list name and select it and then pick the next list from the menu and select that. Finally, if you have voted for all the titles, you can also restrict the results to titles for which you have voted (or not) via the "Rated by you" section. I have a whole complicated chain of bookmarked queries which sometimes involve up to 20 lists being included/excluded and multiple other filters. It is very powerful. For more information, see https://help.imdb.com/article/imdb/discover-watch/using-the-advanced-search-feature/GLUEUYWPQNPTEVPU Hope this helps.

Note that you can also compare lists that are not your own. Create a comparison with your own lists, then modify the Search to replace your list(s) with those of another. For instance, begin with https://www.imdb.com/search/title/?lists=watchlist,checkins and edit to https://www.imdb.com/search/title/?lists=watchlist,ls095267971 where "ls095267971" came from the url of that list: https://www.imdb.com/list/ls095267971/