In-N-Out, one of my fav burger joints, makes an appearance in the first chapter of A Dangerous Stage. It's a chain on the West Coast and Hawaii, I'm not sure how far east they have restaurants. They don't freeze any of their food, it's all fresh, including the buns and the french fries. When you order, you can see them use this french fry hand-crank machine to make their fries, it's pretty cool.
The specific restaurant in A Dangerous Stage doesn't exist at that location, but there's a couple of them near me and I go there way too often than is good for me, but it's oh-so-yummy!