The majority of later manuscripts read "Bethesda," while other early manuscripts read "Bethsaida"
The majority of later manuscripts add the following words: "waiting for the moving of the water. 4 For an angel of the Lord from time to time went down in the pool and stirred up the water. So the one who went in first after the stirring of the water was healed of whatever disease he suffered."
*Here "[when]" is supplied as a component of the participle ("saw") which is understood as temporal
*The phrase "[been sick]" is not in the Greek text, but is supplied from the context