Here are five flawed WT teachings that have no basis in scripture or contradict scripture:
1) Jesus is mediator only for the anointed--not for the vast majority of christians. This directly contradicts 1 Timothy 2:5.
2) Certain sins cannot be forgiven unless confessed before a tribunal of men. No scriptural support for this.
3) Prophecies with multiple fulfillments--for example, Daniel's "seven times." Nothing in the Bible says that prophecies, such as the "seven times" of Daniel, have an additional "modern-day" fulfillment.
4) Allowing women to comment and give parts on meetings. This directly contradicts Paul's clear statement at 1 Cor. 14:34-35 that women are to be silent in church. (as a side note, I think this is misogynistic, but if you're going to take the Bible literally then don't pick and choose)
5) God has always used an organization. Ok, so who was the organization during the time of Job, Abraham, the middle Ages, etc.? And even when God did use an organization (the nation of Israel), he constantly sent prophets--who were individuals outside the religious and political leadership--to condemn the leaders of the organization when they were doing/teaching wrong things. Thus, even when God did use an organization, he endorsed dissent against it when warranted.