diff --git a/core/modules/forum/forum.module b/core/modules/forum/forum.module
index 193afb7..9dd3758 100644
--- a/core/modules/forum/forum.module
+++ b/core/modules/forum/forum.module
@@ -6,7 +6,7 @@
  */
 
 use Drupal\Core\Entity\EntityInterface;
-use Drupal\entity\Plugin\Core\Entity\EntityDisplay;
+use Drupal\node\NodeInterface;
 use Drupal\taxonomy\Plugin\Core\Entity\Term;
 
 /**
@@ -501,18 +501,18 @@ function forum_comment_delete($comment) {
  * Implements hook_field_storage_pre_insert().
  */
 function forum_field_storage_pre_insert(EntityInterface $entity, &$skip_fields) {
-  if ($entity->entityType() == 'node' && $entity->status && _forum_node_check_node_type($entity)) {
+  if ($entity->entityType() instanceof NodeInterface && $entity->isPublished() && _forum_node_check_node_type($entity)) {
     $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
     foreach ($entity->getTranslationLanguages() as $langcode => $language) {
       $translation = $entity->getTranslation($langcode);
       $query->values(array(
         'nid' => $entity->id(),
-        'title' => $translation->title->value,
+        'title' => $translation->label(),
         'tid' => $translation->taxonomy_forums->target_id,
-        'sticky' => (int)$entity->isSticky(),
-        'created' => $entity->created,
+        'sticky' => (int) $entity->isSticky(),
+        'created' => $entity->getCreatedTime(),
         'comment_count' => 0,
-        'last_comment_timestamp' => $entity->created,
+        'last_comment_timestamp' => $entity->getCreatedTime(),
       ));
     }
     $query->execute();
@@ -525,29 +525,30 @@ function forum_field_storage_pre_insert(EntityInterface $entity, &$skip_fields)
 function forum_field_storage_pre_update(EntityInterface $entity, &$skip_fields) {
   $first_call = &drupal_static(__FUNCTION__, array());
 
-  if ($entity->entityType() == 'node' && _forum_node_check_node_type($entity)) {
+  if ($entity instanceof NodeInterface && _forum_node_check_node_type($entity)) {
 
     // If the node is published, update the forum index.
-    if ($entity->status) {
+    if ($entity->isPublished()) {
 
       // We don't maintain data for old revisions, so clear all previous values
       // from the table. Since this hook runs once per field, per object, make
       // sure we only wipe values once.
-      if (!isset($first_call[$entity->nid])) {
-        $first_call[$entity->nid] = FALSE;
+      if (!isset($first_call[$entity->id()])) {
+        $first_call[$entity->id()] = FALSE;
         db_delete('forum_index')->condition('nid', $entity->id())->execute();
       }
       $query = db_insert('forum_index')->fields(array('nid', 'title', 'tid', 'sticky', 'created', 'comment_count', 'last_comment_timestamp'));
-      foreach ($entity->taxonomy_forums as $language) {
-        foreach ($language as $item) {
+      foreach ($entity->getTranslationLanguages() as $langcode => $language) {
+        $translation = $entity->getTranslation($langcode);
+        foreach ($translation->taxonomy_forums as $item) {
           $query->values(array(
-            'nid' => $entity->nid,
-            'title' => $entity->title,
-            'tid' => $item['target_id'],
-            'sticky' => (int)$entity->isSticky(),
-            'created' => $entity->created,
+            'nid' => $entity->id(),
+            'title' => $translation->label(),
+            'tid' => $item->target_id,
+            'sticky' => (int) $entity->isSticky(),
+            'created' => $entity->getCreatedTime(),
             'comment_count' => 0,
-            'last_comment_timestamp' => $entity->created,
+            'last_comment_timestamp' => $entity->getCreatedTime(),
           ));
         }
       }
diff --git a/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php b/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
index 5ff3c63..d5ec65c 100644
--- a/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
+++ b/core/modules/node/lib/Drupal/node/Plugin/Core/Entity/Node.php
@@ -266,9 +266,9 @@ public function getRevisionAuthor() {
     $entity = $this->get('revision_uid')->entity;
     // If no user is given, default to the anonymous user.
     if (!$entity) {
-      return user_load(0)->getBCentity();
+      return user_load(0);
     }
-    return $entity->getBCEntity();
+    return $entity;
   }
 
   /**
diff --git a/core/modules/node/node.module b/core/modules/node/node.module
index c5558ee..e4d9a8f 100644
--- a/core/modules/node/node.module
+++ b/core/modules/node/node.module
@@ -537,7 +537,7 @@ function node_load_multiple(array $nids = NULL, $reset = FALSE) {
  *   (optional) Whether to reset the node_load_multiple() cache. Defaults to
  *   FALSE.
  *
- * @return \Drupal\node\NodeInterface|false
+ * @return \Drupal\node\NodeInterface|null
  *   A fully-populated node entity, or NULL if the node is not found.
  */
 function node_load($nid = NULL, $reset = FALSE) {
@@ -548,11 +548,11 @@ function node_load($nid = NULL, $reset = FALSE) {
 /**
  * Loads a node revision from the database.
  *
- * @param int $nid
+ * @param int $vid
  *   The node revision id.
  *
  * @return \Drupal\node\NodeInterface|null
- *   A fully-populated node entity, or FALSE if the node is not found.
+ *   A fully-populated node entity, or NULL if the node is not found.
  */
 function node_revision_load($vid = NULL) {
   return entity_revision_load('node', $vid);
diff --git a/core/modules/taxonomy/taxonomy.module b/core/modules/taxonomy/taxonomy.module
index 3179464..f44f27a 100644
--- a/core/modules/taxonomy/taxonomy.module
+++ b/core/modules/taxonomy/taxonomy.module
@@ -1131,7 +1131,7 @@ function taxonomy_build_node_index($node) {
   $status = NULL;
   if (config('taxonomy.settings')->get('maintain_index_table')) {
     $status = $node->isPublished();
-    $sticky = (int)$node->isSticky();
+    $sticky = (int) $node->isSticky();
   }
   // We only maintain the taxonomy index for published nodes.
   if ($status && $node->isDefaultRevision()) {
diff --git a/core/modules/tracker/tracker.module b/core/modules/tracker/tracker.module
index e219abc..5536608 100644
--- a/core/modules/tracker/tracker.module
+++ b/core/modules/tracker/tracker.module
@@ -303,14 +303,14 @@ function _tracker_add($nid, $uid, $changed) {
 }
 
 /**
- * Determines the max timestamp between $node->getChangedTime() and the last comment.
+ * Picks the most recent timestamp between node changed and the last comment.
  *
  * @param $nid
  *   A node ID.
  *
  * @return
- *  The $node->getChangedTime() timestamp, or most recent comment timestamp, whichever
- *  is the greatest.
+ *  The node changed timestamp, or most recent comment timestamp, whichever is
+ *  the greatest.
  */
 function _tracker_calculate_changed($nid) {
   // @todo This should be actually filtering on the desired language and just
diff --git a/core/themes/bartik/templates/node.html.twig b/core/themes/bartik/templates/node.html.twig
index 7f59fbc..d45cc55 100644
--- a/core/themes/bartik/templates/node.html.twig
+++ b/core/themes/bartik/templates/node.html.twig
@@ -8,8 +8,8 @@
  *   - id: The node ID
  *   - bundle: The type of the node, for example, "page" or "article".
  *   - authorid: The user ID of the node author.
- *   - createdtime: Formatted creation date. Preprocess functions can reformat it by
- *     calling format_date() with the desired parameters on
+ *   - createdtime: Formatted creation date. Preprocess functions can reformat
+       it by calling format_date() with the desired parameters on
  *     $variables['node']->getCreatedTime().
  *   - promoted: Whether the node is promoted to the front page.
  *   - sticky: Whether the node is 'sticky'. Sticky nodes are ordered above
diff --git a/core/themes/seven/seven.theme b/core/themes/seven/seven.theme
index 62e19cd..f36a0b7 100644
--- a/core/themes/seven/seven.theme
+++ b/core/themes/seven/seven.theme
@@ -186,7 +186,7 @@ function seven_form_node_form_alter(&$form, &$form_state) {
       '#type' => 'item',
       '#wrapper_attributes' => array('class' => array('author', 'container-inline')),
       '#title' => t('Author'),
-      '#markup' => $node->getAuthor()->label(),
+      '#markup' => $node->getAuthor()->getUsername(),
     ),
   );
   $form['revision_information']['#type'] = 'container';