If there's something that can go wrong it will, especially if it's a pano - Les' corollary to Murphy's law.
If you’re out shooting panos, it’s a good idea to have a checklist for setup and shooting. There are few things as frustrating in photography as taking 30 images in a pano and realizing that you forgot to change to manual focus or some other screwup.
My system here is pretty foolproof. Just copy the checklist to your smart phone and have it with you as you set up.