neear the top of the page, there is the following code:
$remove = array();
$remove[] = "";
$remove[] = "x";
$remove[] = "y";
this is an array of form elements that will be removed from the email. add the name of any form element that should not be incused in the email to the array. for example, if you have a hidden form element named "My_Hidden_Form_Element" that you dont want to show in the email, add a new node to the array:
$remove = array();
$remove[] = "";
$remove[] = "x";
$remove[] = "y";
$remove[] = "My_Hidden_Form_Element";