They teach that the little flock is the 144,000 and the other sheep are the Great Crowd, so ...
John 10:16 And I have other sheep, which are not of this fold; those also I must bring, and they will listen to my voice, and they will become one two flock, one shepherd.
The translation of the NWT has thousands of errors - I've only just started to research some of them. Got myself a greek bible / greek dictionary & 3 english versions.
The witnesses usually substitute THE holy spirit for Gods' spirit or active force.
There's a scripture that says "God bought us the blood of his own son"" (NWT) yet the greek version says that it should read God bought us with his own blood - there is no son there.
Another scripture - could be in John. The NWT has translated it that Jesus says you must be in union with each other as I am in union with the father, but the proper version Jesus says you must be one just as the father and I are one. I am in the father and the father is in me.
These are only 3 off the top of my head. There are many many more - some are so subtle.
A great book to read is Fast Facts about Jehovahs' Witnesses.