You should not have the () on the callback field.
You shouldn’t need the add_action so remove
add_action('load_comments', 'custom_comments');
And try:
wp_list_comments('type=comment&callback=custom_comments');
Also, you should extract the $args so they are available in your function:
function custom_comments($comment, $args, $depth) {
$GLOBALS['comment'] = $comment;
extract($args, EXTR_SKIP);
//etc
http://codex.wordpress.org/Function_Reference/wp_list_comments
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