Is it normal for bit of enoki mushroom to appear in my poop?

What's in your poop?: What's in your poop depends upon its digestibility & your bowel's transit time. Things that are difficult to digest (breakdown) are more likely to show up in poop ie kernals of corn. Stuff that's passing through bowels more quickly is also more likely to show up, compared to slower transit time. Mushrooms are relatively digestible but it's possible to show up if not much time btwn eating & pooping