Index: wp-admin/includes/meta-boxes.php
===================================================================
--- wp-admin/includes/meta-boxes.php	(revision 45052)
+++ wp-admin/includes/meta-boxes.php	(working copy)
@@ -807,13 +807,18 @@
 	<p class="hide-if-no-js" id="add-new-comment"><button type="button" class="button" onclick="window.commentReply && commentReply.addcomment(<?php echo $post->ID; ?>);"><?php _e( 'Add comment' ); ?></button></p>
 	<?php
 
-	$total         = get_comments(
+	$wp_get_comments = get_comments(
 		array(
 			'post_id' => $post->ID,
 			'number'  => 1,
-			'count'   => true,
 		)
 	);
+
+	$total = get_comments_number( $post->ID );
+	if ( 0 !== count( $wp_get_comments ) ) {
+		// Get the comment type (comment, trackback),
+		$comment_type = ( ! empty( $wp_get_comments[0]->comment_type ) ) ? $wp_get_comments[0]->comment_type : 'comment';
+	}
 	$wp_list_table = _get_list_table( 'WP_Post_Comments_List_Table' );
 	$wp_list_table->display( true );
 
@@ -828,7 +833,7 @@
 		}
 
 		?>
-		<p class="hide-if-no-js" id="show-comments"><a href="#commentstatusdiv" onclick="commentsBox.load(<?php echo $total; ?>);return false;"><?php _e( 'Show comments' ); ?></a> <span class="spinner"></span></p>
+		<p class="hide-if-no-js" id="show-comments"><a href="#commentstatusdiv" onclick="commentsBox.load(<?php echo $total; ?>,'<?php echo $comment_type; ?>');return false;"><?php _e( 'Show comments' ); ?></a> <span class="spinner"></span></p>
 		<?php
 	}
 
Index: wp-admin/js/post.js
===================================================================
--- wp-admin/js/post.js	(revision 45052)
+++ wp-admin/js/post.js	(working copy)
@@ -95,8 +95,8 @@
 		 *
 		 * @memberof commentsBox
 		 */
-		load: function(total){
-			this.st = jQuery('#the-comment-list tr.comment:visible').length;
+		load: function(total,comment_type){
+			this.st = jQuery('#the-comment-list tr.'+comment_type+':visible').length;
 			this.get(total);
 		}
 	};