Is the defense tipping the pitchers pitches?

Realistically the only people that need to know what pitch is being thrown is the pitcher and the catcher. However, it is also nice to know when an offspeed pitch is coming as most of those pitches are hit to the pull side field. Well, if you look closely some defenses give away those off speed pitches.

The shortsop and the 2B are privy to the catchers signals. They have a great view of what the catcher is calling on each and every pitch. Sometimes the infielders themselves will shift depending on the pitch. They also will sometimes relay the signal to another defender to give them a heads up.

Watch the middle infielders. Do they put a hand behind their back telling the outfielders? Do they verbal something to the 3B to alert him to a changeup? Sometimes, movement comes directly after this signal. They could be giving the batter an opportunity here.

If a coach or batter is alert, he might be able to pick up on the pitch simply because a shortstop is betraying his pitcher.