John 4:2 makes it very clear that Jesus did not baptise although his disciples did. Perhaps he wants to prevent the kind of trouble that Paul met (1 Cor 1:14ff) with some people considering themselves more important because they had been baptised by Jesus. How surprising that they didn’t argue over foot washing.
Chapter 4:19-26 demonstrates well the difference between Jews and Samaritans. Jesus explains that salvation is from the Jews but that the time has come when people will worship in the Spirit and in truth rather than arguing over location. In 4:27, John tells us how surprised the disciples were to find Jesus talking to the Samaritan woman at the well. He also makes the point that it was also surprising that no one said anything to him about it. What do you think the Samaritans meant when they said “this man really is the Saviour of the world” (v42).
Notice that 4:54 is the second sign that Jesus performed (2:11 was the first). One sign a pattern does not make, but we can see that one is developing and we should keep our eyes open for more signs because obviously John means something specific by this language. In 5:18, John makes explicit what was only implicit in the synoptics – by calling God his Father Jesus is making himself equal to God. John 3:36-47 gives more detail regarding some questions I had from Luke, namely about why it is that they should acknowledge Jesus because of the Scriptures. How has Moses testified about Jesus?