Nicodemus shows up again (keep watching).
Also, the feast of booths is not an insignificant detail for us to notice. Sukkot, the feast of booths or tabernacles is celebrated on the 15th day of the 7th month. This is around harvest and commemorates the goodness God gives His people. Also, they live in booths to remember the wilderness period before settling the promised land. In the middle of the 7-day Festival, a priest would go down to the pool of Siloam and draw water and bring it to the temple. It was a raucous occasion, with dancing, singing, juggling and readings! It denoted another good year from God and beckoned rain to come (also reminding of the flood and God’s judgment and salvation).
So, when Jesus stands up at the end of the festival and says “If anyone is thirsty, let him drink” and talks of living water, this is no small thing! Jesus is saying that in Him is the fulfillment of all the celebrations and a beckoning to people to really “taste and see.” This high holiday would have been interrupted by the One and would have made for some interesting conversations, which are seen at the end of the chapter. He is saying that He’s the ultimate festival, and the source of living water. Do you believe that?