Trivia: During the scene in which we see Murtaugh talking to Hunsaker about his involvement with the Drug dealers. Hunsaker mentions 'Air America', a CIA front during the Vietnam. Air America was a film regarding this very thing staring Mel Gibson and filmed three years after Lethal Weapon.
Trivia: In the scene where Danny Glover and Mel Gibson are intervewing the kids who also saw the hookers house blow up, one of the kids has an orange hat on with a black "B" on it. That is the hat for the younger age groups of a summer baseball league in NYC called the "Bonnies." I know this for a fact because I played for the organization my whole life. Why would a kid in LA be wearing the hat? Only interesting to people from NYC, I guess.