Consciously or subconsciously we, teachers, tend to play down the importance of making mistakes that do not convey a lot of information, that is, our students can make that mistake and still be understood, still communicate. Thus we move on from the Present Simple to giving them the vocabulary they will need to reach the unit's goals and so on.
When doing this, though, we are missing one thing which could be important in error correction: possible misunderstandings. For instance, "what do you do?" vs. "what are you doing?" or "sheet" vs. "shit", etc.