Contradiction with Mark 9:17
The father of the boy addresses Jesus directly instead of the disciples.
Mark 9:17: And one of the multitude answered and said, Master, I have brought unto thee my son, which hath a dumb spirit;
Contradiction with Luke 9:38
Similar to Mark, the father speaks to Jesus, demonstrating the father's direct interaction with Jesus, not the disciples.
Luke 9:38: And, behold, a man of the company cried out, saying, Master, I beseech thee, look upon my son: for he is mine only child.