Continuity mistake: During the car chase involving the car driven by the Chinese guy, Murtaugh, and the mobile home, the two cars slide against each other and the right wing mirror on Murtaugh's car is completely wrecked. Once the two cars are separated the wing mirror has miraculously repaired itself. The left wing mirror also does a disappearing / reappearing trick.
Lethal Weapon 4 (1998)
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Directed by: Richard Donner
Starring: Mel Gibson, Danny Glover, Chris Rock, Jet Li, Rene Russo, Joe Pesci, Kim Chan, Steve Kahan
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More mistakes in Lethal Weapon 4
Roger Murtaugh: You ever hear of Ebony Clarke?
Martin Riggs: Yeah, she writes those cheesy sex novels. Why? You boinkin' her?
Roger Murtaugh: No I'm not boinkin' her! Trish is Ebony Clarke!
Martin Riggs: Oh, so you ARE boinkin' her.
Roger Murtaugh: Yeah... Yeah, I'm boinkin' her!
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.