My assumption would be they used a deep fryer for the potatoes, which can be a pain at home.

One thing that makes good home fries, dice up potatoes at prefer size and boil them. When you think the potatoes have about 10 minutes left add a small spoonful of baking soda to the mix and preheat your oven for 450.

Once the potatoes are just slightly soft, drain them and toss them in oil. The baking soda with break down the pectin and crate a layer of mashed potatoes on surface which will brown nicely in the over. Add some salt and seasoning and roast till golden. This can easily be done before hand, I often make these for dinner and then use the leftovers for home fries a day or two later.