I did my PhD at Edinburgh, and my second supervisor was a proud Scotsman. I had a sentence in my thesis that began "Under the hood..." He wrote in the margin:

I did my PhD at Edinburgh, and my second supervisor was a proud Scotsman. I had a sentence in my thesis that began "Under the hood..." He wrote in the margin: "bonnet?" I immediately corrected it, and have since been hyper-aware of the fact that the Americans call the bonnet the "hood" and the boot the "trunk".