The scene where Ho tries to stop two feuding Karate fighters from fighting each other so they can work together to kill Tang Lung. The European karate master just simply throws him aside so they could fight him again.
Tang Lung accidentally almost ending up with a prostitute (or possibly a one-night stand) because of how unfamiliar he is with western customs.
How does he get out of it? He pees a lot. An earlier scene had him ordering nothing but soup at a fancy restaurant because he can't read the menu.