Revealing mistake: When Jackie jumps on the hot air balloon, he is supposed to be REALLY high in the air. Still you can see tops of trees on the lower right corner of the screen.
Suggested correction: You should submit a screenshot of your claim because I can't see any trees to indicate the hot air balloon was low to the ground. You can see plenty of trees in the background, but they're far away and the balloon is way above them. In real life, Chan actually jumped from a plane onto an actual hot air balloon in the sky. It wouldn't make sense for it to be low to the ground because he wouldn't have time to recover by parachute if he messed up.
Suggested correction: Some mountains are extremely tall and above what a hot air balloon flies.