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.
A London broil roast can be cooked in the oven, on the grill or in a Dutch oven on the stove top. Like all beef, London broil roasts should be cooked to no less than 145 degrees for rare, 160 degrees for medium and 175 degrees for well done.