diff --git a/script_v2.cpp b/script_v2.cpp
index 3c20d0c0692..e4f3cec9f7a 100644
--- a/script_v2.cpp
+++ b/script_v2.cpp
@@ -1762,6 +1762,7 @@ void Scumm::o6_actorSet() {
 	}
 	
 	a = derefActorSafe(_curActor, "o6_actorSet");
+	if (!a) return;
 
 	switch(b) {
 	case 76: /* actor-costume */
diff --git a/scumm.h b/scumm.h
index ab72b5560e0..13185a5a6a0 100644
--- a/scumm.h
+++ b/scumm.h
@@ -40,11 +40,7 @@ enum {
 	NUM_SCRIPT_SLOT = 25,
 	NUM_LOCALSCRIPT = 60,
 	NUM_SHADOW_PALETTE = 8,
-#if defined(FULL_THROTTLE)
 	NUM_ACTORS = 30
-#else
-	NUM_ACTORS = 13
-#endif
 };
 
 
diff --git a/sound.cpp b/sound.cpp
index 62f05e9f7d8..8f3cfa13868 100644
--- a/sound.cpp
+++ b/sound.cpp
@@ -385,8 +385,6 @@ void *Scumm::openSfxFile() {
 	return file;
 }
 
-#define NUM_MIXER 4
-
 MixerChannel *Scumm::allocateMixer() {
 	int i;
 	MixerChannel *mc = _mixer_channel;
diff --git a/sound/imuse.cpp b/sound/imuse.cpp
index d074e78056c..84aeefe5773 100644
--- a/sound/imuse.cpp
+++ b/sound/imuse.cpp
@@ -40,11 +40,11 @@ int num_mix;
 #define TRIGGER_ID 0
 #define COMMAND_ID 1
 
-#ifdef SAMNMAX
+//#ifdef SAMNMAX
 	#define MDHD_TAG "MDpg"
-#else
-	#define MDHD_TAG "MDhd"
-#endif
+//#else
+//	#define MDHD_TAG "MDhd"
+//#endif
 
 int clamp(int val, int min, int max) {
 	if (val<min)
@@ -181,9 +181,10 @@ bool SoundEngine::start_sound(int sound) {
 	void *mdhd;
 
 	mdhd = findTag(sound, MDHD_TAG, 0);
-    if (!mdhd) 
+    if (!mdhd)  {
+		warning("SE::start_sound failed: Couldn't find %s", MDHD_TAG);
 		return false;
-
+	}
 	player = allocate_player(128);
 	if (!player)
 		return false;
@@ -996,9 +997,10 @@ bool Player::start_sound(int sound) {
 	void *mdhd;
 	
 	mdhd = _se->findTag(sound, MDHD_TAG, 0);
-	if (mdhd==NULL)
+	if (mdhd==NULL) {
+		warning("P::start_sound failed: Couldn't find %s", MDHD_TAG);
 		return false;
-
+	}
 	_parts = NULL;
 	_active = true;
 	_id = sound;