Contradiction with Matthew 10:14
Luke 9:11 describes welcoming and speaking to people about God's kingdom, while Matthew 10:14 advises leaving and shaking off the dust as a testimony against those who do not receive or listen.
Matthew 10:14: And whosoever shall not receive you, nor hear your words, when ye depart out of that house or city, shake off the dust of your feet.
Contradiction with Matthew 15:24
Luke 9:11 depicts helping all who came, but Matthew 15:24 mentions helping only the lost sheep of Israel.
Matthew 15:24: But he answered and said, I am not sent but unto the lost sheep of the house of Israel.
Contradiction with John 7:8-10
In Luke 9:11, Jesus openly goes to meet people, whereas in John 7:8-10, He initially says He will not go to the feast and then goes secretly.
John 7:8-10: Go ye up unto this feast: I go not up yet unto this feast; for my time is not yet full come.
Contradiction with Matthew 12:19
Luke 9:11 shows Jesus speaking to crowds, yet Matthew 12:19 states He will not strive or cry, nor will anyone hear His voice in the streets.
Matthew 12:19: He shall not strive, nor cry; neither shall any man hear his voice in the streets.