Director Richard Donner said in the film's Blu-ray commentary that the film was shot in such a way that it could be edited with two different endings, one in which Riggs dies and one in which he lives.
Screenwriter Robert Mark Kamen said in October 2012 interview for craveonline that during the time when he was working as screenwriter for Warner Bros. and would often do lot of uncredited work on their films, he also worked on Lethal Weapon 2 and 3.