I had to use the wp debug feature for an issue I had and also found errors on the page peel plugin where the get-options function was called incorrectly. I fixed the error with the following code...
// try to always get the values from the database
$pagepeel_version = get_option('pagepeel_version');
$pagepeel_image_small = get_option('pagepeel_image_small');
$pagepeel_image_big = get_option('pagepeel_image_big');
$pagepeel_ad_url = get_option('pagepeel_ad_url');
Starting at line 89 of pagepeel.php I added the quotes to the options names.
Can the author please add this to the next version.