When Hawk and his son are walking to the final match, the audio used for his son is from the speech he gave his Father in the scene before. He could be heard saying, "You weren't talking about me, you were talking about you," although the audio is lowered.
When Mike gets kidnapped by his grandfather's thugs, they speed away in a white pickup truck. Hawk gets in his semi and instantly catches up to them. There's no way he would have gotten the rig up to speed that quickly. Also, you can hear Mike still yelling "Dad" as if he is close by, even though the white pickup is already a half mile down the road.