"Do It Again"

I listened to the two-albums-on-one-CD re-issue of Friends and 20/20 this morning and noticed that, appropriate for the retrospective theme, the lyrics of "Do It Again" contain the titles of a couple previous Beach Boys songs:  "California Girls" in the second verse ("With sun-tanned bodies and waves of sunshine / California girls and a beautiful coast line") and "Lonely Sea" in the bridge ("And with a girl the lonely sea looks good with moonlight").