diff --git a/interface/src/Application.cpp b/interface/src/Application.cpp
index c5d913c65e..40f7de7e85 100644
--- a/interface/src/Application.cpp
+++ b/interface/src/Application.cpp
@@ -1016,7 +1016,7 @@ static void sendVoxelEditMessage(PACKET_HEADER header, VoxelDetail& detail) {
     }
 }
 
-const glm::vec3 Application::getMouseVoxelWorldCoordinates(VoxelDetail _mouseVoxel) {
+const glm::vec3 Application::getMouseVoxelWorldCoordinates(const VoxelDetail _mouseVoxel) {
     return glm::vec3((_mouseVoxel.x + _mouseVoxel.s / 2.f) * TREE_SCALE,
                      (_mouseVoxel.y + _mouseVoxel.s / 2.f) * TREE_SCALE,
                      (_mouseVoxel.z + _mouseVoxel.s / 2.f) * TREE_SCALE);
@@ -2206,7 +2206,7 @@ void Application::displayStats() {
     }
 }
 
-void Application::renderThrustAtVoxel(glm::vec3 thrust) {
+void Application::renderThrustAtVoxel(const glm::vec3& thrust) {
     if (_mousePressed) {
         glColor3f(1, 0, 0);
         glLineWidth(2.0f);
diff --git a/interface/src/Application.h b/interface/src/Application.h
index 655268024b..1d50b5065f 100644
--- a/interface/src/Application.h
+++ b/interface/src/Application.h
@@ -67,7 +67,7 @@ public:
 
     void wheelEvent(QWheelEvent* event);
     
-    const glm::vec3 getMouseVoxelWorldCoordinates(VoxelDetail _mouseVoxel);
+    const glm::vec3 getMouseVoxelWorldCoordinates(const VoxelDetail _mouseVoxel);
     
     Avatar* getAvatar() { return &_myAvatar; }
     Camera* getCamera() { return &_myCamera; }
@@ -95,7 +95,7 @@ private slots:
     
     void setRenderFirstPerson(bool firstPerson);
     
-    void renderThrustAtVoxel(glm::vec3 thrust);
+    void renderThrustAtVoxel(const glm::vec3& thrust);
     void renderLineToTouchedVoxel();
     
     void setFrustumOffset(bool frustumOffset);
diff --git a/interface/src/Avatar.cpp b/interface/src/Avatar.cpp
index c89a078f23..a2ff33ca52 100644
--- a/interface/src/Avatar.cpp
+++ b/interface/src/Avatar.cpp
@@ -617,7 +617,6 @@ void Avatar::simulate(float deltaTime, Transmitter* transmitter) {
     
     // set head lookat position
     if (!_owningAgent) {
-        //if (_camera)
         if (_interactingOther) {
             _head.setLookAtPosition(_interactingOther->calculateAverageEyePosition());
         } else {