I've watched this many times. Both Gowdy and Comey have tells. Comey, the narcissist, flashes brief "dupers delight" and tries to disguise it by puffing out his cheeks with a quick blow of air…
11 seconds in for a brief glimpse
1:13 indignant for being questioned
Gowdy's are not so easy to describe. They all, imho, have to do with where his eyes are looking, and the subtlety of how they move. Watch a few times, and you can hopefully validate what I'm seeing. First, remember he is a former prosecutor, he's used to hearing bullshit. He's also not dumb enough to ask questions he cant answer himself.