At the end of the code example, the passage should not appear in bold, since it exists in the code example on page 154 already.

$form['submit'] = array(
'#type' => 'submit',
'#value' => t('Submit')
);
return $form;

Also, in line 8
$form['name']['user_name'] = array(

['user_name'] should not be in bold typeface.