Oh, but "Gotta Be Crazy" changed considerably from 1974-75. Listen to the Wembley Pool Show of Nov. 16, 1974 and Boston Garden show of June 18, 1975; the 1974 version is a different beast indeed. Dave is playing acoustic and switches to electric midway!
As for "Raving and Drooling" it is much heavier in 1974; someone hits a gong after the verse "raving and drooling I fell on his neck with a scream." Very heavy and creepy, indeed! The 1975 Raving is much more subdued, but Rick goes off on his Moog.

-Echorec