Hi Orbison,
For me, one of the biggies is that the Org states that Jesus is not the Mediator for the "Great Crowd" (those that don't have the heavenly hope). He is Mediator only for the 144,000. I have a feeling though that most witnesses don't truly realize that.
The bible states:
1 Tim.2:5,6; "For there is one God, and one mediator between God and men, a man, Christ Jesus, who gave himself a corresponding ransom for all"
Yet their literature states:
Watchtower 1979 April 1 p.31 "Is Jesus the "mediator" only for anointed Christians?…… So in this strict Biblical sense Jesus is the "mediator" only for anointed Christians.……The "great crowd" of "other sheep" that is forming today is not in that new covenant. However, by their associating with the "little flock" of those yet in that covenant they come under benefits that flow from that new covenant."
Watchtower 1979 November 15 p.27 Benefiting from "One Mediator Between God and Men""They recognize that they are not spiritual Israelites in the new covenant mediated by Jesus Christ, nor part of the "chosen race, a royal priesthood, a holy nation."——1 Pet. 2:9. 24 Yet they do benefit from the operation of the new covenant. They benefit from this just as, in ancient Israel, the "alien resident" benefited from residing in among the Israelites who were in the Law covenant.—Ex. 20:10; Lev. 19:10, 33, 34; Rev. 7:9-15. 25 To keep in relationship with "our Savior, God," the "great crowd" needs to remain united with the remnant of spiritual Israelites."
Watchtower 1989 August 15 pp.30-31 Questions From Readers "Is Jesus the Mediator only for spirit-anointed Christians or for all mankind, since 1 Timothy 2:5, 6 speaks of him as the "mediator" who "gave himself a corresponding ransom for all"? The Bible contains both basic teachings and deep truths, which are solid food for study ……To grasp what Paul is saying, we must first appreciate that the Bible sets out two destinies for faithful humans: (1) perfect life on a restored earthly paradise and (2) life in heaven for Christ’s "little flock," numbering 144,000. Clearly, then, the new covenant is not a loose arrangement open to all mankind. It is a carefully arranged legal provision involving God and anointed Christians.This should help us to understand 1 Timothy 2:5, 6. Here the reference to "mediator" was made after the five other occurrences of the word in letters written earlier. Hence, Timothy would have understood Jesus’ mediatorship to be His legal role connected with the new covenant. ……Consequently, 1 Timothy 2:5, 6 is not using "mediator" in the broad sense common in many languages. It is not saying that Jesus is a mediator between God and all mankind. …… The apostle John referred to these at 1 John 2:2. But he indicated that others too will receive the benefit of Christ’s sacrifice: "He is a propitiatory sacrifice for our sins, yet not for ours only but also for the whole world’s."Those of ‘the whole world’ are all who will gain eternal life in a restored earthly paradise. Millions of such approved servants of God now have that earthly hope. ……"
Hope this helps.