Interesting question. I was a JW for 35 years (from birth), so I really didn't know any different. I believed all the stuff in the publications and thought "well, I could look it up, but why would they lie? Isn't this stuff verifiable?" It wasn't until I started looking online that I realized how the WTS commits academic fraud over and over again by citing sources that are taken out of context or by saying stuff like "leading Biblical scholars" and not telling who they are. What really opened my eyes to how the WT spins everything was Ray Franz' book "Crisis of Conscience". It's amazing how the current publications take things from the past so far out of context that they are hardly recognizable. Here were some things I didn't know up until the last few months (after 35 years, with 25 begin VERY active in the 'truth').
That the WTS claims that Christ is only the mediator for the 144,000, not ALL men as the Bible clearly states.
The whole "Malawi vs. Mexico" incident that Franz discusses
That the 'society' taught for years that Christ had returned in 1874, that the end was coming FOR SURE in 1914 and then again in 1925. The recent (and I mean since the early 80's) publications have all made it seem like Russell knew that the significance of 1914 in advance and was the ONLY one to know that. Truth is, according to Franz, he took the idea from 2nd Day Adventists that had formulated the idea centuries earlier (thinking that 1799 had some significance).
How disfellowshipping matters were decided. What a CROCK! It's either Biblical or it's not, yet the WTS lets DF'ing matters be decided by the whim of whomever is on the GB at the time.
That the GB didn't always exist in some form or another. The current WTS would have you believe that the GB has always been functioning as the 'faithful and discreet slave class, when in reality, it was an individual - first Russell, then Rutherford, then Knorr.
That the concept of the Trinity WAS IN FACT a part of the early apostles' teachings and NOT invented in 325 at the council of Nicea as the JW's always lead one to believe.
I guess I could go on, but it's humbling and staggering how much I didn't know about my own religion, the one that I had defended so vigorously over the years. Boy do I feel stupid....lol.