 The 2001 DVD release by Warner Brothers omited a number of sound effects from  the origianl Sony VHS release.  The sound when characters die; when Sting  attacks the Spiders in Mirkwood; Smaugs screams as he attacks Lake Town; the  flapping of the Thrushs wings in all scenes; when the arrows bounce off of  Smaug and when the Black Arrow pierces Smaugs belly; and the howling of the  Wargs during the Battle of Five Armies.