The distinct details each witness gives subtly help explain why Bob was wearing a suit and why he went to the shopping center. The more instances of these coincidences we have, the less likely intentional fabrication becomes.
The Healing at Peter's House
Matthew 8:16 states that in the evening, people brought the sick and demon-possessed to Jesus to be healed.
Mark 1:21 and 29-32 clarifies why they waited until the evening: the event happened on the Sabbath, and the people would have waited until the Sabbath ended at sundown to bring their sick, as public healing was controversial on the Sabbath. Mark's casual mention of the Sabbath is not presented as an explanation for Matthew's timing, but it fits perfectly.
The Feeding of the 5,000
Mark 6:39 mentions that Jesus commanded the people to sit down on the "green grass", an seemingly insignificant detail.
John 6:4 casually notes, in a different context within his narrative, that the miracle occurred around the time of the Passover festival. Passover happens in the spring (March/April), the only time of year when the grass in that region would be green after the winter rains.
John 6:5 records Jesus asking Philip where they should buy bread. One might wonder why Philip was singled out.
Luke 9:10 (in the context of the same event) and John 1:44 (in an unrelated passage) provide the answer: the miracle took place near the town of Bethsaida, which was Philip's hometown. Jesus naturally turned to the disciple with local knowledge.
Herod Antipas' Information Source
Matthew 14:1-2 recounts Herod the tetrarch hearing about Jesus and telling his servants that Jesus must be John the Baptist raised from the dead, showing his anxiety. It raises the question of how Matthew would know what was said in Herod's private conversation.
Luke 8:3 provides a potential explanation in an unrelated list of Jesus' female followers: one of them was Joanna, "the wife of Chuza, Herod's household manager". Joanna could have been an internal source of information from Herod's palace.
The Dispute Among the Disciples and the Foot-Washing
Luke 22:24 describes a dispute among the disciples during the Last Supper about which of them was the greatest. Jesus uses this occasion to teach a lesson on humility and servant leadership.
John 13:4-15 describes the seemingly spontaneous event of Jesus washing his disciples' feet during the meal. John doesn't mention the dispute, and Luke doesn't mention the foot-washing, but together, the foot-washing serves as a powerful, practical demonstration of the exact lesson Jesus was teaching in response to their argument in Luke.
Mary and Martha
In Luke 10:38-42, we get the famous story of Jesus visiting Mary and Martha of Bethany. Martha, the practical sister, is trying to get the house in tip-top shape for Jesus and becomes annoyed at her sister Mary, the emotional sister, who is just sitting at Jesus’ feet.
Over in John’s Gospel (ch. 11), Jesus comes to see the same sisters because their brother Lazarus has died. John says that Martha immediately ran to Jesus, while Mary “remained seated in the house” (John 11:20). Martha welcomes Jesus, while Mary sits. Martha tells Mary that Jesus is calling to her, and only then does she rise.
But instead of going to weep at the tomb, as the others expect (11:31), she “fell at [Jesus’] feet” (11:32) in a striking parallel to Luke. Mary is recorded as weeping, while Martha is not. Once they get to the tomb, Jesus asks for the stone to be rolled away, and the ever-practical Martha points out that “by this time there will be an odor, for he has been dead four days” (11:39).
In short, these two sisters show consistent character traits in two completely different stories that do not refer to each other. The most simple explanation for this is that both authors are writing about real women.
The Sons of Thunder
Mark 3:17 tells us that James and John, the sons of Zebedee, were nicknamed “the sons of thunder” by Jesus. Mark never explains why Jesus would give these two such a memorable sobriquet. However, Luke’s gospel tells the story of Jesus being rejected by the Samaritans because he is a Jew on his way to Jerusalem. Luke continues: “And when his disciples James and John saw it, they said, “Lord, do you want us to tell fire to come down from heaven and consume them?” But [Jesus] turned and rebuked them” (9:54-55).
So just as Luke 9 helps illuminate characters from John’s Gospel, so does Luke 10 help explain a reference in Mark’s Gospel. It’s highly unlikely that Luke would have invented two different stories to explain the motivations of characters in two other gospels, especially since John was almost certainly written later. The simpler explanation is, once again, that both are talking about real incidents with real people.
The Transfiguration
Upon coming down from the mount of transfiguration, Luke’s gospel tells us that the disciples “kept silent and told no one in those days anything of what they had seen” (Luke 9:36). But why? Wouldn’t you tell somebody if the rabbi you were following starting glowing white and had a conversation with Moses and Elijah? Luke provides no answers.
Thankfully, Mark does in his account of the transfiguration: “And as they were coming down the mountain, [Jesus] charged them to tell no one what they had seen, until the Son of Man had risen from the dead” (Mark 9:9).
So the reason they were silent is that Jesus had commanded them to be (something Mark never fails to mention). Maybe Luke knew about Mark’s story and didn’t feel a need to repeat this tidbit. Perhaps, but that only goes to show that he was not just copying Mark’s account. He is providing independent verification of the same event.
Pilate's interrogation
In Luke 23:1-4, Pilate asks Jesus whether he is a king, and Jesus gives an answer that is certainly not a denial and that many scholars take for a terse, idiomatic acknowledgement. Then Pilate declares that he finds him innocent. How can this be explained? Answer: Luke is giving only a summary of the interview. In a fuller account, we discover that Jesus told Pilate that His kingdom was not of this world. (John 18:36)
Also, in John 18:32, Pilate asks Jesus whether he is a king. What prompted that question? (Nothing earlier in the chapter indicates that this was a charge leveled against Jesus.) Answer: Though John does not record it, the Jews did make that very charge against Jesus. (Luke 23:1-2)
An Accusation at the Cross
Mark records that people who saw Jesus on the cross derided him by saying, “Aha! You who would destroy the temple and rebuild it in three days, save yourself, and come down from the cross!” (Mark 15:29-30). Yet nowhere in Mark (or Matthew or Luke, for that matter) does Jesus make this claim. It seems to come out of nowhere.
But in John, in a different context entirely, we see the Jews ask Jesus for a sign, and he replies, “Destroy this temple, and in three days I will raise it up” (John 2:19). John goes on to explain that Jesus was speaking metaphorically about his body being resurrected, but the metaphor was obviously lost on the crowd. Again, John clearly did not put this story in his gospel to explain the crowd’s cries in the synoptic gospels, but it unintentionally does so.
Conclusion
These subtle interconnections, spanning different narratives and contexts, are viewed as powerful evidence that the Gospel writers were relaying accounts of real events they had witnessed or heard from reliable sources, rather than coordinating a fictional story.
It's highly unlikely that later fabricators from all different parts of the world, decades after Jesus, tie each other’s loose ends up so neatly in such a subtle fashion if the recorded narratives were completely disconnected from the historical events? It’s far more likely the Gospel authors were referring to eyewitness history, and not making up history.
