Lethal Weapon 4

Richard Donner asked Jet Li to slow down during action sequences, because he was moving faster than the camera shutter speed, and it wasn't registering on film.

When Riggs pulls the restaurant's fire alarm pull station handle, the sprinklers also spray water. The sprinklers would only go on if their fusible links melt due to heat (from a fire).

The previous Lethal Weapon movies, Lethal Weapon (1987), Lethal Weapon 2 (1989), and Lethal Weapon 3 (1992), are featured in the end credits as film stills.

The UK video and DVD versions are the same as the UK cinema version, all of which had 1m 33s of footage cut to receive the more commercially lucrative "15" certificate. Among the cuts were edits to head-butts, neck breaks, kickings, an eye gouging, a man being garroted with wire, and heavy reductions in sound during the fight scenes to remove violent noise effects. Various scenes of threat (such as the house fire scene) were also reduced in visuals and sound, and sometimes frames were removed from punches and kicks to faces to reduce their impact. The UK Blu-ray is uncut and retains the "15" rating.