Contradiction with James 1:22
This verse emphasizes being doers of the word, not just hearers, whereas Matthew 13:18 begins the explanation of the parable where hearing is the initial focus.
James 1:22: But be ye doers of the word, and not hearers only, deceiving your own selves.
Contradiction with Mark 4:14-15
These verses also deliver the parable explanation similarly, but variations in wording can reflect slightly differing theological emphases on how the word is received by the hearers.
Mark 4:14-15: The sower soweth the word.