Plot hole: Why would a timer be used on a booby trap in the mail box, only that it serves later on to kill Briggs?
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Suggested correction: As a back up detonator.
Other mistake: In the beginning credits Harry says "This is the 44 magnum, the most powerful hand gun in the world" but later when he's at the range with David Soul and the other cops, when asked about his what his gun loads he says he uses .357 lite magnum.
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Suggested correction: When at the range with the rookie traffic cops, Harry says he shoots "light specials" out of his 44 magnum which provide more control than a .357 magnum with wad cutters.
