diff -u b/core/modules/comment/comment.module b/core/modules/comment/comment.module
--- b/core/modules/comment/comment.module
+++ b/core/modules/comment/comment.module
@@ -555,7 +555,7 @@
     $comment->setCreatedTime($created_time);
     $comment->changed->value = REQUEST_TIME;
     $comment->in_preview = TRUE;
-    $comment_build = entity_view($comment, 'full', NULL);
+    $comment_build = entity_view($comment, 'full');
     $comment_build['#weight'] = -100;
 
     $preview_build['comment_preview'] = $comment_build;
@@ -565,7 +565,7 @@
     $build = array();
     $parent = $comment->getParentComment();
     if ($parent && $parent->isPublished()) {
-      $build = entity_view($parent, 'full', NULL);
+      $build = entity_view($parent, 'full');
     }
   }
   else {
diff -u b/core/modules/comment/src/Entity/Comment.php b/core/modules/comment/src/Entity/Comment.php
--- b/core/modules/comment/src/Entity/Comment.php
+++ b/core/modules/comment/src/Entity/Comment.php
@@ -80,7 +80,7 @@
       $this->setPublished($published);
     }
     if ($this->isNew()) {
-      // Add the comment to database. This next section builds the thread field..
+      // Add the comment to database. This next section builds the thread field.
       $thread = $this->getThread();
       if (empty($thread)) {
         if ($this->threadLock) {
diff -u b/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php b/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php
--- b/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php
+++ b/core/modules/comment/src/Plugin/Action/UnpublishByKeywordComment.php
@@ -27,7 +27,7 @@
    * {@inheritdoc}
    */
   public function execute($comment = NULL) {
-    $build = entity_view($comment, 'full', NULL);
+    $build = entity_view($comment, 'full');
     $text = drupal_render($build);
     foreach ($this->configuration['keywords'] as $keyword) {
       if (strpos($text, $keyword) !== FALSE) {
diff -u b/core/modules/comment/src/Plugin/views/row/Rss.php b/core/modules/comment/src/Plugin/views/row/Rss.php
--- b/core/modules/comment/src/Plugin/views/row/Rss.php
+++ b/core/modules/comment/src/Plugin/views/row/Rss.php
@@ -106,7 +106,7 @@
 
     // The comment gets built and modules add to or modify
     // $comment->rss_elements and $comment->rss_namespaces.
-    $build = entity_view($comment, 'rss', NULL);
+    $build = entity_view($comment, 'rss');
     unset($build['#theme']);
 
     if (!empty($comment->rss_namespaces)) {