Trivia: At the end of the film, the police officer advising Beatty and Voight to go away and not to come back is James Dickey, the screenwriter and author of the book the film is based on.
Trivia: Burt Reynolds broke his tailbone while going down the rapids.
Trivia: Actor Billy Redden (who portrayed the inbred hillbilly banjo player) actually could not play the banjo at all. Despite training for the film, Redden's hand movements simply weren't convincing, so a local musician was hired to hide behind Redden and portray the left-handed fingerplay in complex banjo-picking shots. We only see the briefest snippets of Redden handling the banjo with his own two hands; however, when the iconic "Dueling Banjos" scene reaches a fever pitch, the left hand seen working the banjo frets is that of the real musician hiding behind Redden.
Answer: No wound. Shook his head and dove from the canoe. Refused his life jacket. Just ridden with guilt as he was dead set against burying the hillbilly.
It's ambiguous. In an unused shot from that scene, Drew does grab at his head before falling overboard. Still, I too think he simply passes out from the stress.