Code in hook_init()

Instead of checking what page the user is on via hook_init() to add Thickbox, it should be contextual....

/**
 * Implementation of hook_init().
 */
function thickbox_init() {
  // Code from the block_list funtion in block.module.
  // If the path doesn't match any of the exeptions, load header files.
  $path = drupal_get_path_alias($_GET['q']);
  $regexp = '/^('. preg_replace(array('/(\r\n?|\n)/', '/\\\\\*/', '/(^|\|)\\\\<front\\\\>($|\|)/'), array('|', '.*', '\1'. preg_quote(variable_get('site_frontpage', 'node'), '/') .'\2'), preg_quote(variable_get('thickbox_pages', ''), '/')) .')$/';
  // Compare with the internal and path alias (if any).
  $page_match = preg_match($regexp, $path);
  if ($path != $_GET['q']) {
    $page_match = $page_match || preg_match($regexp, $_GET['q']);
  }
  if (!$page_match) {
    _thickbox_doheader();
  }
}

Instead of automatically adding Thickbox on a selection of pages, Thickbox should be added contextually based on what's in there with an API.