As a Van freak, I must contribute!
Scott, did you know that the original radio version of Brown Eyed Girl edited out the line "makin' love in the green grass" and replaced it with a line from an earlier verse.
As for meaning in Van songs, well, good luck!
Chances are he improvised most of it on the spot!
I agree with freddynl's explanation of why Tuesday is "so slow", although the Easybeats disagree. In Friday On My Mind they felt that Thursday "goes too slow".
Peter