Coming from the East Coast (NY and MA) to CA there were some sayings that people knew I wasn’t from here. Here were some:
1) Sneakers I say. They say tennies or tennis shoes
2) You guys I say. They say you all
3) This one gets to me a lot when I first came out here: They say I am going down south. Which to me means the southern part of the US (Fl, NC, SC, Al, Georgia, etc). They mean southern CA.
When I lived in Boston I would say Coke/Pepsi for a soft drink but my friends would say tonic. And the one thing I constantly got corrected was Aunt ( I pronounce it Ant) but my friends would say no it’s Aunt with the u stressed.