WordPress recently added some “helpful” error messages warning you when you’re not doing certain things correctly. Specifically, adding scripts and/or styles incorrectly using the wp_enqueue_* function.

However, even though it appears they tell you where things went wrong (via trigger_error), it actually just points you to the _doing_it_wrong function.

Fortunately, those hook-crazy developers threw us a bone in that function:

do_action( 'doing_it_wrong_run', $function, $message, $version );
//

Now we can figure out the offender ourselves with a hook:

/**
 * Because new WP 3.3 "doing it wrong" warnings don't really tell you where you screwed up...
 * @param string $function The function that was called.
 * @param string $message A message explaining what has been done incorrectly.
 * @param string $version The version of WordPress where the message was added.
 */
function abt_doing_it_wrong_helper($function, $message, $version){
	$before = <<<EOD
<strong>$function:</strong> v$version
EOD;
	debug_whereat(3, 5, $before);
}
add_action( 'doing_it_wrong_run', 'abt_doing_it_wrong_helper', 10, 3 );
//

And the helper function for printing debug_backtrace (use your own flavor):

/**
 * Pretty-print debug_backtrace()
 * @param int $limit {optional} when to stop printing - how many recursions up/down
 * @param int $skip {optional} when to start printing - how many calls to skip over
 * @param string $before {optional} extra html to print before the table, inside debug container
 * @param string $after {optional} extra html to print before the table, inside debug container
 *  */
function debug_whereat($limit = false, $skip = false, $before = '', $after = ''){
	static $debug_whereat_counter; if( !$debug_whereat_counter) $debug_whereat_counter = 0;
	$uid = $debug_whereat_counter++;
	?>
	<div class="debug trace">
		<?php echo $before; ?>
	<table>
		<thead><tr>
			<th id="th-index-<?=$uid?>"><i>nth</i></th>
			<th id="th-line-<?=$uid?>">Line</th>
			<th id="th-file-<?=$uid?>">File</th>
			<th id="th-method-<?=$uid?>">Method</th>
		</tr></thead>
		<tbody>
	<?php

	$backtrace = debug_backtrace();
	if( $skip ) $backtrace = array_slice($backtrace, $skip);

	foreach($backtrace as $index => $trace){
		//force quit
		if($limit !== false && $index == $limit){
			?>
			<tr><td colspan="4"><em>----- FORCE STOP RECURSION -----</em></td></tr>
			<?php
			break;
		}

		?>
		<tr class="trace-item">
			<th headers="th-index-<?=$uid?>"><?=$index?></th>
			<td headers="th-line-<?=$uid?>" class="line"><?=$trace['line']?></td>
			<td headers="th-file-<?=$uid?>" class="file"><?=$trace['file']?></td>
			<td headers="th-method-<?=$uid?>" class="method">
				<code><?=$trace['function']?></code>
				<?php
				if(!empty($trace['args'])){
					echo '<br />';
					while(!empty($trace['args'])){
						?>	{<i><?php print_r(array_shift($trace['args']) ); ?></i>}	<?php
					}//	while !empty $trace['args']
				}
				?>
			</td>
		</tr>
		<?php
	}
	?>
	</tbody></table><?php echo $after; ?></div>
	<?php

}//	function debug_whereat