Contradiction with Mark 6:14
This verse states that Herod heard of Jesus because His name had become known, while Matthew 14:1 implies Herod heard about Jesus specifically due to the activities of His followers.
Mark 6:14: And king Herod heard [of him]; (for his name was spread abroad:) and he said, That John the Baptist was risen from the dead, and therefore mighty works do shew forth themselves in him.