Amateur Hip Rotation versus High Level Stretch n Fire.

Lead arm in the 'shoulder swing plane' powered by rotation versus Hand/Forearm pivot point powered by Stretch n Fire.

Push the bat versus whip the bat.

Swinging 'AROUND' the ball versus Swinging 'BEHIND' the ball.

Swinging 'around the body' versus swinging 'out from' the body.

Hip and Shoulder rotation versus Hip and Shoulder RESISTING rotation.

Very poor swing mechanics.