I am very puzzled by the lyrics to "Whistle In". They do not make sense to me.

And then there is "With Me Tonight":
On and on she goes
I know for sure you're with me tonightWhat? That's it? I'm just not getting it.....

I'm not sure there's much to "get" necessarily - Brian just needed dummy lyrics for the little musical ideas he was coming up with, and I doubt he gave the lyrics on those tracks more than a few moments of thought.