Absent-Mindness: we may not remember information we are given when our minds are occupied elsewhere. For example you may have trouble remembering the lecture material in history class if you are staring out the window.
Transience: this means that our memories often fade over time. For example you are more likely to remember an episode of your favorite television program right after you see it but as time passes you’re most likely to forget the details of that program.
Misattribution: this happens when we miss remember the source of information. For example, you may remember a story but not remember who told you the story.