I found this awesome site from the University of Texas that discusses all sorts of common mistakes that we make as FL teachers and how to correct them based on research. Best of all, their suggestions really make sense and fit well with the Two Week Model that I use to teach my classes.
If you're short on time, here are three of the best segments (IMHO):
1. Inductive Approaches to Teaching Grammar
2. Vocabulary: From Input to Output
Definitely worth a look! The wheels are already turning in terms of my lessons for next week!