Contradiction with Matthew 14:16
Jesus says the crowd does not need to go away, but to give them food, contrasting with the disciples' request to send them away.
Matthew 14:16: But Jesus said unto them, They need not depart; give ye them to eat.
Contradiction with John 6:10
Jesus instructs the people to sit down in preparation to feed them, rather than sending them away as suggested in Mark 6:36.
John 6:10: And Jesus said, Make the men sit down. Now there was much grass in the place. So the men sat down, in number about five thousand.
Contradiction with Luke 9:13
Jesus challenges the disciples to give the crowd something to eat themselves, opposing the idea of sending them away.
Luke 9:13: But he said unto them, Give ye them to eat. And they said, We have no more but five loaves and two fishes; except we should go and buy meat for all this people.
Contradiction with Matthew 15:32
Jesus has compassion and doesn't want to send people away hungry, which contrasts with the disciples' suggestion in Mark 6:36.
Matthew 15:32: Then Jesus called his disciples [unto him], and said, I have compassion on the multitude, because they continue with me now three days, and have nothing to eat: and I will not send them away fasting, lest they faint in the way.
Contradiction with John 6:5-6
Jesus proactively addresses the need to feed the crowd and tests his disciples, which contrasts with the passivity of sending them away.
John 6:5-6: When Jesus then lifted up [his] eyes, and saw a great company come unto him, he saith unto Philip, Whence shall we buy bread, that these may eat?