TLC released a rather interesting video with an added scene that viewers didn't see on Monday night. It's the scene where Zach is upset at the low grade he was given in speech class. Many viewers commented on the tension between Jeremy and Zach in that scene and later in the show.
In this video, Matt and Amy discuss that. Matt asks if Jeremy and Zach got into a tussle. Amy said it's a disagreement over how they were each graded. The subsequent conversation between Matt and Amy essentially turns into Matt and Amy arguing about Jeremy being a better speaker than Zach and if it's fair. You can probably guess which parent is backing which kid. :-)