I'm an editor, brought up in England now living next door to Uncle Sam and trying to save Canada from throwing the cultural identity away. Here are some I see and hear regularly:

Mother's Day. It's not possessive, it's descriptive, so no apostrophe please!

barbeque should that be pronounced bar-beek?

Ceasar salad,

and of course war-chesta-shigher sauce , no wonder so many people just call it Lea & Perrin's!