Holy crap.
I didnt even see that! Nice of Autolite to give me an extra gasket. So much for quality control. It's not like it was an extra one that came off of an earlier plug and got left in the tube. If you have ever tried to remove one of those metal gaskets you know what a pain it is to get them off.
The NGK gaskets were crimped on and non-removable without cutting them off.