diff --git a/slides/common/prereqs.md b/slides/common/prereqs.md
index 95e39afa..7840b527 100644
--- a/slides/common/prereqs.md
+++ b/slides/common/prereqs.md
@@ -191,6 +191,7 @@ done
 if which kubectl; then
   kubectl get deploy,ds -o name | xargs -rn1 kubectl delete
   kubectl get all -o name | grep -v service/kubernetes | xargs -rn1 kubectl delete --ignore-not-found=true
+  kubectl -n kube-system get deploy,svc -o name | grep -v dns | xargs -rn1 kubectl -n kube-system delete
 fi
 ```
 -->
diff --git a/slides/common/sampleapp.md b/slides/common/sampleapp.md
index 0e76edef..a75f0141 100644
--- a/slides/common/sampleapp.md
+++ b/slides/common/sampleapp.md
@@ -8,8 +8,9 @@
 
 <!--
 ```bash
+cd ~
 if [ -d container.training ]; then
-  mv container.training container.training.$$
+  mv container.training container.training.$RANDOM
 fi
 ```
 -->
diff --git a/slides/kube/kubectlexpose.md b/slides/kube/kubectlexpose.md
index c2f4054b..51a4d349 100644
--- a/slides/kube/kubectlexpose.md
+++ b/slides/kube/kubectlexpose.md
@@ -131,7 +131,10 @@ Note: please DO NOT call the service `search`. It would collide with the TLD.
   IP=$(kubectl get svc elastic -o go-template --template '{{ .spec.clusterIP }}')
   ```
 
-<!-- ```hide kubectl wait deploy elastic --for condition=available``` -->
+<!--
+```hide kubectl wait deploy elastic --for condition=available```
+```hide sleep 5``` (give some time for elasticsearch to start... hopefully this is enough!)
+-->
 
 - Send a few requests:
   ```bash
diff --git a/slides/kube/kubectlproxy.md b/slides/kube/kubectlproxy.md
index bc1f9cdf..6ae9f4c5 100644
--- a/slides/kube/kubectlproxy.md
+++ b/slides/kube/kubectlproxy.md
@@ -47,7 +47,7 @@
 .exercise[
 
 - Run an open proxy to the Kubernetes API:
-  ```bash
+  ```
   kubectl proxy --port=8888 --address=0.0.0.0 --accept-hosts=.*
   ```