Continuity mistake: After Danny speaks with Megan, he places a paper flower on her desk. In the close-up shots, the paper flower is facing her. But in the quick shot of Danny leaving for the elevator, its facing to her left.
During the fight with Zhou Cheng, Cheng does a forward flip and kicks Danny, making him stumble backwards. In the shot of Cheng lying on the ground, Danny is holding his stomach. In the shot immediately afterwards, he's holding his chest.