The actors were really driving through the streets of Hollywood and saying their lines while being filmed. Director Mark Newton didn't want to use green screen.
All falls in the movie were done by actor Myles McLane. He had to do them all several times to get it right.
The stunt car driving was done by director Mark Newton. If you look closely you may be able to see him in the car.
The scene where Ruthie hangs her jacket on the tree for Michael to find was created because it was getting hotter and the actors wanted to take off their big coats.