In order to recall something specific, one needs detailed context in order to recall that specific memory. Such a mind cannot easily recall the specific instance, but need a series of memory triggers in order to arrive at the said memory.
For example: when trying to remember a specific line from a movie, the person needs to be reminded first the overarching plot of the movie, then the what part of the movie the scene took place, then a summary of the scene (including the significance of the line). All of this must take place as a "trigger" for the person to be able to recall said movie line.
Kelsey: "...has anyone seen my list by the way? It's a piece of paper with the name Ross written in big letters..."
Steph: What is that from?
Kelsey: Friends, don't you remember?
Steph: Wait what happened in the episode? (Kelsey explains) OH, ya! I remember now... I'm a trigger-mind, I need context before I can remember funny lines from Friends.