Change hook order

Different implementations of the same hook execute in an order based on the weight value in the system table then the alphabetical order. You can change the order by updating the weight in the db but it could be more fine tuned to just change the hook order by using hook_module_implements_alter().

/**
 * Implements hook_module_implements_alter().
 */
function mymodule_module_implements_alter(&$implementations, $hook) {
  // Function authcache_authcache_preclude must be executed after
  // anothermodule_authcache_preclude.
  if($hook == 'authcache_preclude') {
    if (array_key_exists('authcache', $implementations)) {
      $my_module = $implementations['authcache'];
      unset($implementations['authcache']);
      $implementations['authcache'] = $my_module;
    }
  }
}

Display errors - WSOD

The bootstrap override the values you could set to display error ad the reporting level. To be 100% sure everything is printed out when something fails in a blank screen (wsod), make index.php like this:

Properly render a field

Drupal offers a few (sometimes complicated...) solutions to output a field. Lets take an example with a date field.
To display the full rendered field: field_view_field()