A few details you can listen for in Beach Boys songs:
- During the second 'Who Ran The Iron Horse?' section of 'Cabinessence', if you listen closely you can hear Dennis softly singing entirely different lyrics in the background. It sounds a bit spooky once you notice it (the lyric he sings is "Truck driving man do what you can / High-tail your load off the road / Out of night-life-it's a gas man / I don't believe I gotta grieve / In and out of luck / With a buck and a booth / Catchin' on to the truth / In the vast past, the last gasp / In the land, in the dust, trust that you must / Catch as catch can").
- If you listen closely to the fade of 'All I Want To Do' (not to be confused with 'All I Wanna Do') you can hear Dennis having sex with a prostitute in the studio. I know this sounds like it's probably some kind of urban legend, but it's been confirmed by long-time Beach Boys engineer Stephen Desper, who recorded the "session".
- On the fade of the single version of 'Do It Again', you can hear workshop noises. These were originally recorded for a 'Smile' track called 'Workshop'. They're really out of place in 'Do It Again', but the group figured "Hey, we payed for the session to have these sounds recorded so we might as well just use 'em somewhere".
- Carl Wilson sings lead on 'God Only Knows', but he's not on the final section of the song ("God only knows what I'd be without you") cause he was tired and went home. The three voices you hear there are Brian twice, and Bruce.
- During the "Sometimes I feel very sad" part of 'I Just Wasn't Made For These Times', you can hear the background vocals singing "Can't find nothin' I can put my heart and soul into". But if you listen very closely, you can also hear different backing vocals singing "Cuando será? Un dia será". Sounds very distant and ghostly and you probably won't even notice them unless you know they're there.