diff --git a/examples/side-by-side.js b/examples/side-by-side.js
index f526d63efe..994be60551 100644
--- a/examples/side-by-side.js
+++ b/examples/side-by-side.js
@@ -20,7 +20,7 @@ var domMap = new ol.Map({
   })
 });
 
-if (!ol.BrowserFeature.HAS_WEBGL) {
+if (ol.BrowserFeature.HAS_WEBGL) {
   var webglMap = new ol.Map({
     renderer: ol.RendererHint.WEBGL,
     target: 'webglMap'
diff --git a/package.json b/package.json
index 48ab5d8f12..1d587882b5 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,6 @@
     "url": "https://github.com/openlayers/ol3/issues"
   },
   "devDependencies": {
-    "closure-util": "*"
+    "closure-util": "~0.8.2"
   }
 }
diff --git a/tasks/serve.js b/tasks/serve.js
index e868aa6ebc..61ed865dbf 100644
--- a/tasks/serve.js
+++ b/tasks/serve.js
@@ -43,4 +43,8 @@ manager.on('ready', function() {
   server.listen(3000, function() {
     log.info('ol', 'Listening on http://localhost:3000/ (Ctrl+C to stop)');
   });
+  server.on('error', function(err) {
+    log.error('ol', 'Server failed to start: ' + err.message);
+    process.exit(1);
+  });
 });