OREOS: Any brand of gluten free chocolate sandwich cookie will work. The closest I have found in taste and texture to regular brand-name Oreo's are the Great Value brand gluten free chocolate sandwich cookies from Walmart!
CARAMEL SAUCE: Most caramel sauce is gluten free, but unfortunately not all of it. I used Hershey's brand Caramel Topping (the one that comes in a glass jar), which according to their website is gluten free.
Why sea salt? Normally in my recipes I call for kosher salt, but because kosher salt changes so much brand-by-brand it doesn't always provide consistent results. While that is okay in most recipes, in baking recipes, exact amounts matter, so I call for sea salt because the salt granules will be more consistent from one brand to the next. I NEVER recommend table salt for any recipe because it has added iodide that gives it a bitter flavor.
Not gluten free? Use all purpose flour instead of cornstarch in the filling if you want a slightly denser cheesecake and use regular Oreos for the crust.