Here is a list of contradictions between what the Watchtower Society says and what the Bible says:
The Watchtower says that Judas Iscariot left the Lord's Evening Meal (Memorial) BEFORE Jesus instituted the New Covenant and passed the Wine and Bread.
What does the Bible say?:
Luke 22:13: They went, found things as He had told them, and they prepared the Passover.
Luke 22:14: When the hour had come, He sat down with the Twelve Apostles.
Luke 22:15: He said to them, "I have earnestly desired to eat this Passover with you before I suffer,
Luke 22:16: for I tell you, I will no longer by any means eat of it until it is fulfilled in the Kingdom of God."
Luke 22:17: He received a Cup, and when He had given thanks, he said, "Take this, and share it among yourselves,
Luke 22:18: for I tell you, I will not drink at all again from the fruit of the vine, until the Kingdom of God comes."
Luke 22:19: He took Bread, and when He had given thanks, He broke it, and gave to them, saying, "This is My Body which is given for you. Do this in memory of Me."
Luke 22:20: Likewise, He took the Cup after Supper, saying, "This Cup is the New Covenant in My Blood, which is poured out for you.
Luke 22:21: But behold, the hand of him who betrays Me IS WITH ME ON THE TABLE. (NOTICE -- This is AFTER Jesus started the New Covenant and passed the Wine and Bread!)
Luke 22:22: The Son of Man indeed goes, as it has been determined, but woe to that man through whom He is betrayed!"
Luke 22:23: They began to question among themselves, which of them it was who would do this thing.
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The Watchtower Society says that Jesus became "The Christ" at His Baptism.
What does the Bible say?:
Luke 2:10: The angel said to them, "Don't be afraid, for behold, I bring you Good News of great joy which will be to all the people.
Luke 2:11: For there is born to you, this day, in the City of David, a Savior, WHO IS Christ the Lord.
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If anyone can think of any others, please add them.