Mother driving paralyzed
If the mother was paralyzed from the waist down, how on Earth was she able to drive a car??? I know it sounds stupid to worry about something like that in a movie full of mistakes, plotholes and incoherences, but I just find it hard to believe that no one involved in the making of the film realised such an obvious mistake! And she appears driving a car not just once, but a couple of times!
Still, I really enjoyed this big mess of a film. God bless the 70s.