Regarding the prediction for the end in 1975, the Watchtower articles gave just enough to excite the members but not enough so that it could claim deniablity when the event did not occur. However, one would have to have been a Jehovah's Witness at that time to realize how much the date was emphasized at the Kingdom Halls and assemblies. There was little question that the "end" would come at that time.
Circuit and District overseers were very pointed in their talks. I remember one who said that we were no longer counting the remaining time in years but rather "months, days and hours." Another said that our preaching work was coming to an end. He said we were like Joshua marching around Jericho for the seventh time. Since these men were representatives of the Watchtower Society, all JWs felt that this was the official word from headquarters. The increased activity of JWs in the field service during that time reflects the intensity of their belief in the 1975 date.
It is hard to understand how those JWs who lived through this time can now deny how important we felt that date was to us. It must be a community amnesia that has taken place.