And how does one explain the way a song about such relatively "macho" subject matter succeeds so well with a vocal line a full octave above any normal male singing range, sustained in falsetto completely throughout? (source)
From Rolling Stone:
Wilson wrote "Don't Worry Baby" for Ronnie Bennett, hoping she'd cut it as a follow-up to the Ronettes' "Be My Baby," a Phil Spector production he listened to so much he wore out the grooves. From the opening drum riff (played by Hal Blaine, also heard on "Be My Baby"), "Don't Worry Baby" is sheer homage but also vintage Beach Boys, with one of Wilson's finest falsetto-punctuated lead vocals.
And how about those background vocals? They wash over the listener like a huge wave at high tide. That third verse (after the guitar "solo") is something! I think the song transcends at that point.