In Episode 5 Fokker is a guest for dinner at Plesman's house. Plesman's son asks Fokker about the principle of flight. Fokker explains that you need tot speed up to get lift. The son reacts surprises and starts mumbling about underpressure on top of the wing. The writer wants toch tell us that Fokker does not understand the true principle of flight. But they are Both right: 75% is Newtons 3rd law of Action = Reaction and 25% is Bernoulli's law (the curved upside of the wing speeds up airflow, creating underpressure).