Here are two examples of lies:
In 1943 the Society changed the date 606 B.C. for the beginning of the Gentile times to 607 B.C. The explanation -- which was complete gobble-de-goop -- was given in the book The Truth Shall Make You Free. It can be shown that the explanation was a deliberate lie, as were the explanations given in later non-English editions of the book.
The explanation went something like this: "Because the Jewish year began in the fall, and the Gentile times began in 606 B.C., the Gentile times really began in the fall of 607 B.C. So that's what we'll use from now on." One lie is that the writer deliberately ignored the fact that the Society had always taught that the Gentile times began at the beginning of October of 606 B.C., so the apparent backward shift by a few months (from the beginning of 606 B.C. back to the fall of 607 B.C.) was really by exactly one year, and so the justification for the change simply doesn't cut it. Since the writer (Fred Franz) must have known this, and deliberately conconcted a misleading explanation, he deliberately lied. This was compounded in later years when various editions of the book were published in languages other than English. In these, the explanation involved 607 and 608 B.C. rather than 606 and 607 -- which is ludicruous. Since the translators and original writer were not so stupid as not to notice this, they deliberately lied to their readers. I've confirmed this in editions of the book in French, Spanish, Arabic, Danish and Norwegian.
A second lie is related to the above. In the 1943 book the writer neglected to deal with the date of Jerusalem's destruction. The Society had long taught that Jerusalem was destroyed about August of 606 B.C. and that the Gentile times began about two months later, October 606 B.C. When this book moved the beginning of the Gentile times back to October 607 B.C., it left the date for Jerusalem's destruction at August 606 B.C. The book specifically stated in the entire book -- including in the pages after the 606-607 swap had been made -- that 606 was the year of Jerusalem's destruction. So here the Society was teaching that the Gentile times began some 10 months before Jerusalem was destroyed!
This obvious problem was "handled" the next year, in the 1944 book The Kingdom Is At Hand. It contained a discussion of Bible chronology, and contained a chart of dates. The date for Jerusalem's destruction was shown in the chart as 607 B.C. There was a footnote that pointed to this new date, and it referred the reader back to a specific page in the 1943 book where the change was supposedly discussed and justified. However, the cited page contains no such justification. So here is another deliberate lie. It's obviously deliberate, because no writer and team of editors could possibly make such an error. And the fact that the writer saw fit to include a footnote specifically making a false claim proves his deceitful intent. It's deceitful because the writer knew perfectly well that most JWs wouldn't actually look up the citation, and that the few who did, and then questioned the Society about the lie, would be booted out of the JW organization.
A complete discussion of this business can be found here: http://www.geocities.com/osarsif/606.htm under the title "The Evolution of 606 to 607 B.C.E. in Watchtower Chronology".
AlanF