People behind the plate calling out where the catcher is set up.

[CoachJD]

So anyone that yells anything from the stands is a coach? You better get way bigger dugouts then because you are going to have to put them all in the dugout.

Everyone is yelling stuff from the stands, and no they are not coaches.

What about a parent in the stands calling pitches for the whole game? Is that not coaching?

A single person calling out pitch locations on every single pitch is 100% coaching the players during the game. That's not "Suzie, keep your elbow up!"

 

[boo201]

According to DD, players in the dugout use specific cheers for the batter to indicate catcher set-up.