Going through search results, answers have the same title as their questions, but lack the '[closed]' status indicator if the thread has been closed.
This is an example from a search here on Meta. The title in the middle obviously belongs to an off-topic question here on Meta, since it relates to one community only (namely Stack Overflow).
Since there is no indication that this thread was closed, I proceeded to flag it, only to find out it actually had been closed.
This is certainly not a big problem, but it would make the search results clearer, and the process of going through them quicker, and point out if the information potentially gleaned from a snippet is actual or not.
Such a label could easily be ignored if it's not relevant for the user searching, but the additional information might prove useful for users in certain circumstances.