Slow Motion Freestyle Breathing Mistake Beginners
Common mistake is Breathing during the Freestyle (aka Front Crawl). Try Swimming a long distance without breathing. You will notice how easy it is. It is super efficient and powerful. But as soon as you take a breathe of air everything tends to fall apart.
Keep that arm up while breathing. This allow your body to stay in a streamline and move forward instead of coming to a complete stop.
Pay attention to the slow motion video footage and visualize what you need to do to correct the breathing stroke.