Biggest mistake on the Serger video

This video is all about the correct way to feed fabric under the foot to get greater accuracy. It also includes how to do perfect corners, hide a thread chain on start up and how to feed the ruffler foot.
This is a copy of my FB Live so please understand that it is not edited as most of my Youtube videos are.

Видео Biggest mistake on the Serger video канала Deborah Canham