Last night I remembered that the vibraphone part in "Let's Go Away for Awhile" was an-other part that sounded like it would be pretty easy to figure out. The pairs of notes are either sixths or augmented fifths. I also included the four-note guitar phrase that I figured out last year.
I listened to Pet Sounds yester-day, and then I learned the electric bass part for "Don't Talk (Put Your Head on My Shoulder)." It starts about halfway through the first verse, so the beginning sounds a bit weird. I have to specify that this is the electric bass part because I'm pretty sure there's also an acoustic bass part con arco.
There's a repeated glissando from a G# to a C#. Or at least there's something of a glissando. The G# slides down, but not all the way to C#. I played the G# on the D string (6th fret) so it can't go all the way to C#. I think it's that way on the recording too. It's like an interrupted glissando. In any case, that part comes after the line "Don't talk; put your head on my shoulder," so it could be interpreted as that movement - placing a head on a shoulder.