 SPOILER: After the shark blows up, the groaning sound effects during  the shot of the carcass sinking are the same ones the truck makes as  it crashes off a cliff in Steven Spielberg (I) (qv)s first film,  _Duel (1971) (TV)_ (qv). The sound effect is from the original  _Creature from the Black Lagoon (1954)_ (qv).