It would be nice to have the Coordination Warning that pops up when opening a file have the ability to have elements listed or at the very least the Linked File that needs to be checked. I can't see this being hard to do since that info is at least know otherwise the warning would have not popped up. You could have the file listed in that warning dialog box, or have it like the "Error" tree and expand to see file and items. Bonus, if you can somehow highlight the objects in plan or create a view that shows the differences in different colors.