NFL Xtreme Codes -

Big head mode:
Enter BIGHEAD BOBBY as a name at the create free agent screen.

Flat head mode:
Enter COINHEAD COREY as a name at the create free agent screen.

Long neck mode:
Enter GEORGE GIRAFFE as a name at the create free agent screen.

Long arms:
Enter MONKEY MICKEY as a name at the create free agent screen.

Short arms:
Enter SHRIMPY SEAN as a name at the create free agent screen.

Big players:
Enter BIG BEN as a name at the create free agent screen.

Small players:
Enter TINY TOM as a name at the create free agent screen.

Reversed animations:
Enter LAMEBOY LENNY as a name at the create free agent screen.