Couple of "catches" in chapter 7 (pages 208 & 209)of "commit.php":
1)
$movie_name = trim($_row[ 'movie_name' ]); should be
$movie_name = trim($_POST[ 'movie_name' ]);

2)
VALUES
   ( '".$_POST['movie_name']."' ,
   '".$_POST['movie_year']."' ,
   '$movie_release' , (add the comma after _release')

Bruce