Continuity mistake: In the scene near the end of the film when Murtaugh shoots at Wah Sing Ku and mistakenly kills the last of the four fathers, you can clearly hear an empty shell casing hit the floor, although he is using a revolver, which do not spit out the empty shells as they are fired.
Lethal Weapon 4 (1998)
Plot summary
Directed by: Richard Donner
Starring: Mel Gibson, Danny Glover, Chris Rock, Jet Li, Rene Russo, Joe Pesci, Kim Chan, Steve Kahan
Riggs and Murtaugh stumble upon an Asian mob counterfeiting scheme while working out personal problems.
Rick Regan
More mistakes in Lethal Weapon 4
Lee Butters: You have the right to remain silent. So shut the fuck up. You have the right to an attorney. If you can't afford an attorney, we will provide you with the dumbest fucking lawyer on Earth. If you hire Johnny Cochrane, I'll kill you!
Trivia: As Mel Gibson, Danny Glover and Chris Rock leave the Chinese restaurant (down the stairs), you can see the umbrella handed to Chris Rock hit him in the face.
Question: I wonder, what was the point of having a gunfight with the armored man at the beginning of the film?
Answer: It was put in the film to introduce the concept of Rianne and Lorna being pregnant and to bring in the joke about the news article about Roger, not to mention giving the film an action-heavy opening.