What was the exact conversation of Jones and his friends in the pub planning the attack on the farm?
We do not know of Jones' conversation with the other humans. We know of it through narration, but the exact nature of the conversation eludes us. We know that Jones speaks to whoever would listen and that he seeks to reclaim his farm. We know that the other humans are convinced that the farm will fail and seek to capitalize on this failure themselves and that when it turns out that the farm is successful, they launch the rebellion and help Jones. Yet, we do not exactly hear the conversation. Part of this might be due to the fact that we never really hear of Jones. We know him through the narration, but we never really interact with him through conversation or through anything in a primary manner. I think that this is deliberate on Orwell's part, bringing out how Tsar Nicholas was also relatively misunderstood and not clear to both his people and the rest of the world which helped to hasten his own demise, similar to Jones. It is also significant because Jones' own silence and lack of fully understanding is what makes him an easy target for the pigs' propaganda machine, making Jones out to be the embodiment of all evil and the ultimate "boogey- man" for the other animals when the pigs assume full power.