The wording "Cool Door" indicates that the oven door has 3 layers of glass or 4 layers for models with a pyrolytic (self-cleaning) function, instead of 2. This ensures that the oven door stays a lot cooler than the requirements of European standards, and therefore an additional layer of safety.
Telescopic runners make it safe and easy to slide baking trays or racks in and out of the oven. They let you check on your food without having to reach into the hot oven.