diff --git a/docs/deploying/index.rst b/docs/deploying/index.rst
index 5e98f98c..01584d36 100644
--- a/docs/deploying/index.rst
+++ b/docs/deploying/index.rst
@@ -17,7 +17,7 @@ Hosted options
 --------------
 
 - `Deploying Flask on Heroku <https://devcenter.heroku.com/articles/getting-started-with-python>`_
-- `Deploying Flask on Google App Engine <https://cloud.google.com/appengine/docs/standard/python/getting-started/python-standard-env>`_
+- `Deploying Flask on Google App Engine <https://cloud.google.com/appengine/docs/standard/python3/runtime>`_
 - `Deploying Flask on AWS Elastic Beanstalk <https://docs.aws.amazon.com/elasticbeanstalk/latest/dg/create-deploy-python-flask.html>`_
 - `Deploying on Azure (IIS) <https://docs.microsoft.com/en-us/azure/app-service/containers/how-to-configure-python>`_
 - `Deploying on PythonAnywhere <https://help.pythonanywhere.com/pages/Flask/>`_
diff --git a/docs/errorhandling.rst b/docs/errorhandling.rst
index 2f4b7335..b565aa3e 100644
--- a/docs/errorhandling.rst
+++ b/docs/errorhandling.rst
@@ -210,7 +210,7 @@ behavior.
 If there is an error handler registered for ``InternalServerError``,
 this will be invoked. As of Flask 1.1.0, this error handler will always
 be passed an instance of ``InternalServerError``, not the original
-unhandled error. The original error is available as ``e.original_error``.
+unhandled error. The original error is available as ``e.original_exception``.
 Until Werkzeug 1.0.0, this attribute will only exist during unhandled
 errors, use ``getattr`` to get access it for compatibility.
 
diff --git a/docs/templating.rst b/docs/templating.rst
index 74c6ad7c..0d558c8c 100644
--- a/docs/templating.rst
+++ b/docs/templating.rst
@@ -3,7 +3,7 @@
 Templates
 =========
 
-Flask leverages Jinja2 as template engine.  You are obviously free to use
+Flask leverages Jinja2 as its template engine.  You are obviously free to use
 a different template engine, but you still have to install Jinja2 to run
 Flask itself.  This requirement is necessary to enable rich extensions.
 An extension can depend on Jinja2 being present.
@@ -100,7 +100,7 @@ by default:
 Standard Filters
 ----------------
 
-These filters are available in Jinja2 additionally to the filters provided
+Flask provides the following Jinja2 filters in addition to the filters provided
 by Jinja2 itself:
 
 .. function:: tojson
diff --git a/docs/testing.rst b/docs/testing.rst
index 2a00d211..20064e5a 100644
--- a/docs/testing.rst
+++ b/docs/testing.rst
@@ -423,7 +423,7 @@ command line. ::
 
     @app.cli.command('hello')
     @click.option('--name', default='World')
-    def hello_command(name)
+    def hello_command(name):
         click.echo(f'Hello, {name}!')
 
     def test_hello():
@@ -450,7 +450,7 @@ This is useful for testing complex validation rules and custom types. ::
 
     @app.cli.command('hello')
     @click.option('--name', default='World', callback=upper)
-    def hello_command(name)
+    def hello_command(name):
         click.echo(f'Hello, {name}!')
 
     def test_hello_params():