Each brand is trying to find a way to get a leg up on the competition in a tight market space. The above picture is what I found on my last grocery run. What caught my eye was the asterisk next to the non-GMO popcorn claim. My guess was the ingredients list would include soybean, canola, or corn oil.
The temperature for broiling in an oven is 260 degrees Celsius or  500 degrees Fahrenheit. Medium heat is about 177 degrees Celsius or  350 degrees Fahrenheit.
Oven Broiler Temperature Choice. I have a new electric oven that allows you to adjust the broiler temperature anywhere between 400 to 575 degrees. It can be set in regular, convection or maxi broil modes, but for each, the temp can be changed.