You get the complete car. Items that are extra would be extra capacity battery, custom plates. I think those are the only extra options. I ordered a white one with black wheels and standard battery and paid zero for it. Although I’ve heard others getting charged shipping. I did not. Great toy for the kids. Enjoy.
The one awarded thru Tesla is a “Founders” series car where the only option selectable was color. Otherwise you receive black turbine wheels and a Founders license plate. Some time after I placed the order, radioflyer emailed to inform me the car would be receiving the refreshed fascia, then about a month later, that it’d be shipped with the longer range battery, all complimentary.