When Lo Fong stabs at Chon atop the belltower, his blade is seriously bent, and he drops it. However, when the two of them get back to the base of the tower and Fong grabs the sword, you can see that it is perfectly straight, without even a crease to indicate it was ever bent.
Actually, that's not a slip-up. That's a flexible steel sword used in martial arts, it's razor thin and slightly curved. It has been used in many Jackie movies like, Drunken Master 2, Project A, etc. Most Westerners would not be familiar with this weapon, since I saw this movie in the theater, people all around me were joking about how 'easily' the sword bent during the fight scene.