For those who are true crime diehards, you might want to check out these guys:
https://www.youtube.com/c/TheBehaviorPanel/videos
They have analyzed body language, choice of wording, speech cadence, eye movement of folks like Michael Petersen, Scott Peterson, and Chris Watts and others. They play a clip, discuss what they saw, and then play it again. I learned some new things from some of these videos like folks switching from "we went to the pool" to "we would go to the pool" this came up in the Michael Petersen interviews. The latter way of describing something is not describing what actually happened.
In their analysis of Chris Watts, they pick up on stuff like his swaying, his breathing, how he shares information.