diff --git a/advanced_topics/modules_and_packages.ipynb b/advanced_topics/modules_and_packages.ipynb
index cb1f719189b60dd94728baebb94c4bf7d1dde077..94994e265b660d37af3ddc9074bf3ebf5aab40ab 100644
--- a/advanced_topics/modules_and_packages.ipynb
+++ b/advanced_topics/modules_and_packages.ipynb
@@ -85,8 +85,8 @@
     "\n",
     "\n",
     "Before we can use our module, we must `import` it. Importing a module in\n",
-    "Python will make its contents available to the local scope.  We can import the\n",
-    "contents of `mymodule` like so:"
+    "Python will make its contents available in the local scope.  We can import the\n",
+    "contents of `numfuncs` like so:"
    ]
   },
   {
@@ -342,7 +342,7 @@
     "1. Built-in modules (e.g. `os`, `sys`, etc.).\n",
     "2. In the current directory or, if a script has been executed, in the directory\n",
     "   containing that script.\n",
-    "3. In directories listed in the PYTHONPATH environment variable.\n",
+    "3. In directories listed in the `$PYTHONPATH` environment variable.\n",
     "4. In installed third-party libraries (e.g. `numpy`).\n",
     "\n",
     "\n",
diff --git a/advanced_topics/object_oriented_programming.ipynb b/advanced_topics/object_oriented_programming.ipynb
index 6ce41605fc589428e8462bc0d9ba33ea93930497..40e01b70427412bacbd77909c88b4a88959d999f 100644
--- a/advanced_topics/object_oriented_programming.ipynb
+++ b/advanced_topics/object_oriented_programming.ipynb
@@ -1282,7 +1282,7 @@
    "metadata": {},
    "source": [
     "> Simple classes such as the `Notifier` are sometimes referred to as\n",
-    "  [_mixins_](https://en.wikipedia.org/wiki/Mixin).\n",
+    "> [_mixins_](https://en.wikipedia.org/wiki/Mixin).\n",
     "\n",
     "\n",
     "If you wish to use multiple inheritance in your design, it is important to be\n",
diff --git a/advanced_topics/object_oriented_programming.md b/advanced_topics/object_oriented_programming.md
index e5504cf616955e1f41545526f339e15f22abb1ac..5ffbfc7c63b3be4b0704a717852a49bdffc1efd7 100644
--- a/advanced_topics/object_oriented_programming.md
+++ b/advanced_topics/object_oriented_programming.md
@@ -1026,7 +1026,7 @@ print(so.run('did you notice that functions are objects too'))
 
 
 > Simple classes such as the `Notifier` are sometimes referred to as
-  [_mixins_](https://en.wikipedia.org/wiki/Mixin).
+> [_mixins_](https://en.wikipedia.org/wiki/Mixin).
 
 
 If you wish to use multiple inheritance in your design, it is important to be