I definitely remember things that wouldn't be useful for life, but are useful entertainment-wise, such as boss's patterns in a video game or how a villain was defeated in an anime and so on. As for things that are useful for life, well... I've found that I remember subjects that interest me, like various grammar rules and theories used for analyzing literature (such as feminist criticism theory or postcolonial criticism theory). As for anything else, well... It's a lot easier for me to remember something if I can picture it visually, but even visual images like people's faces I have a hard time remembering. It all depends on how interested I am in the subject/thing.