There were also a number of cases where convention speakers went far beyond the official WT line - probably out of the need for self-glorification. Probably some tapes may still exist of these - not much doubt was left that the end was to come in the mid-seventies. Remember the one that made out that if only we knew how long Adam was in the garden before Eve, then we actually would know the date?
Someone here has also attested to the ridiculous statements made by Schroeder after 1975 that probably Jehovah really planned it for 1975, but put it off so that we could preach from door to door some more...
Not to say that many faithful JWs today have the slightest notion of any of this, or the ability to admit that it happened.