I want to stress I am not trying to cast any doubts about the authenticity or accuracy of the scriptures, etc. I am just curious about things like this and I think it is a fair question.
Look at the last several verses of this account in John 4. The woman herself published this account widely. We also have no reason to believe that Jesus did not tell the disciples after the fact what had happened. If you lived closely with a group of men, you would no doubt have conversations about events that were significant. Perhaps the disciples said, "Jesus, we heard about this event with the woman. What happened?" We do not know how the conversation went, but we cannot draw a conclusion from what we do not find recorded.
sidewalk: It might warrant another thread, but I personally lean to Apollos as the author of Hebrews. Hal Lindsey gave a great argument for his authorship and it is the most plausible argument I have ever heard.