pacing would be a fault.

No follow through,  lifting,  double tracking

Interesting question!  I will be watching this thread to see what some of our experienced members who breed and show (SV type shows) have to say regarding faulty movement.

Here is what the SV standard and the FCI standard say regarding gait since there is nothing more specific regarding movement:

 http://germanshepherddog.com/regulations/breed_standard.htm

http://www.fci.be/uploaded_files/166g01-en-sv.doc

Gait

"The German Shepherd is a trotting dog. Length and angulation of front and rear legs must be in proper proportion to one another to permit the dog to move the rear leg underneath the body, matching the reach of the rear legs with that of the front legs and at the same time, keeping the topline over the back relatively undisturbed. Any tendency for over-angulation of the rear reduces firmness and endurance of the dog and therefore, working capability. Correct body proportions and angulation result in a ground-covering gait which moves close to the ground and conveys the impression of effortless movement. With the head held slightly forward and the tail slightly lifted, the dog trotting evenly and smoothly, we see a softly moving topline which flows without interruption from neck to tail tip."

Here is where you can read Linda Shaw's very detailed description of gaits and movement:

 http://www.shawlein.com/The_Standard/Index_Page/Index_Page.htm

what nona said, lifting front, moving wide in front or rear, throwing elbows out, poor undereach or follow through, twisty or loose hocks, kicking up in the rear.

some things that can show up in gaiting are weak back, rolling side to side, bouncing, croup bouncing, front of dog lower than back/rear.

Don't forget crabbing :)  But Rik has almost all of them :)