this is what I am saying
"I have a plan. I always have a plan. But the things about plans is that no matter how much you plan there is always those inexorable, pesky _____."

Those pesky what? What is word for the things that can go wrong on a plan? If there is even one!

Thank yo so very much.

Snags? Hitches?

Glitches?

complications.. catches.. obstacles..

Discombobulations?

variables?

If you want to make it into a trip/travel metaphor, there are often unexpected, unwanted, unanticipated potholes along the way...

(Didn't notice - the issue is by now most likely moot: the question was posed last September)