diff --git a/source/core/textures/buildtiles.h b/source/core/textures/buildtiles.h
index 309825e65..2370bc264 100644
--- a/source/core/textures/buildtiles.h
+++ b/source/core/textures/buildtiles.h
@@ -218,7 +218,7 @@ public:
 
 	void Reload()
 	{
-		buffer = std::move(Base->GetPalettedPixels(0));
+		buffer = Base->GetPalettedPixels(0);
 	}
 };
 
@@ -383,7 +383,7 @@ inline const uint8_t* tilePtr(int num)
 	{
 		auto tex = TileFiles.tiledata[num].texture;
 		if (!tex || tex->GetTexelWidth() <= 0 || tex->GetTexelHeight() <= 0) return nullptr;
-		TileFiles.tiledata[num].rawCache.data = std::move(tex->GetTexture()->Get8BitPixels(false));
+		TileFiles.tiledata[num].rawCache.data = tex->GetTexture()->Get8BitPixels(false);
 	}
 	TileFiles.tiledata[num].rawCache.lastUseTime = I_nsTime();
 	return TileFiles.tiledata[num].rawCache.data.Data();
diff --git a/source/games/duke/src/2d_d.cpp b/source/games/duke/src/2d_d.cpp
index 803d04441..1ad0a8ab6 100644
--- a/source/games/duke/src/2d_d.cpp
+++ b/source/games/duke/src/2d_d.cpp
@@ -454,7 +454,7 @@ public:
 			if (!S_CheckSoundPlaying(ENDSEQVOL3SND8))
 			{
 				sound++;
-				waittime = clock + SoundEnabled()? 1'000'000'000 : 5'000'000'000;	// if sound is off this wouldn't wait without a longer delay here.
+				waittime = clock + (SoundEnabled()? 1'000'000'000 : 5'000'000'000);	// if sound is off this wouldn't wait without a longer delay here.
 			}
 			break;
 
@@ -663,13 +663,6 @@ void doorders(const CompletionFunc& completion)
 //
 //---------------------------------------------------------------------------
 
-static void PlayBonusMusic()
-{
-	if (MusicEnabled() && mus_enabled)
-		S_PlaySound(BONUSMUSIC, CHAN_AUTO, CHANF_UI);
-
-}
-
 class DDukeMultiplayerBonusScreen : public DScreenJob
 {
 	int playerswhenstarted;
diff --git a/source/games/duke/src/actors.cpp b/source/games/duke/src/actors.cpp
index 14a8231ee..d5838f2e7 100644
--- a/source/games/duke/src/actors.cpp
+++ b/source/games/duke/src/actors.cpp
@@ -2813,7 +2813,7 @@ void handle_se14(int i, bool checkstat, int RPG, int JIBS6)
 		{
 			if (statstate)
 			{
-				if (!S_CheckSoundPlaying(hittype[i].lastvx) == 0)
+				if (!S_CheckSoundPlaying(hittype[i].lastvx))
 					spritesound(hittype[i].lastvx, i);
 			}
 			if ((!checkstat || !statstate) && (ud.monsters_off == 0 && sc->floorpal == 0 && (sc->floorstat & 1) && rnd(8)))
diff --git a/source/games/duke/src/actors_r.cpp b/source/games/duke/src/actors_r.cpp
index ddcfec339..95414d22a 100644
--- a/source/games/duke/src/actors_r.cpp
+++ b/source/games/duke/src/actors_r.cpp
@@ -4449,7 +4449,7 @@ static int fallspecial(int g_i, int g_p)
 		hittype[g_i].picnum = SHOTSPARK1;
 		hittype[g_i].extra = 1;
 	}
-	else if (isRRRA() && sector[g_sp->sectnum].floorpicnum == RRTILE7820 || sector[g_sp->sectnum].floorpicnum == RRTILE7768)
+	else if (isRRRA() && (sector[g_sp->sectnum].floorpicnum == RRTILE7820 || sector[g_sp->sectnum].floorpicnum == RRTILE7768))
 	{
 		if (g_sp->picnum != MINION && g_sp->pal != 19)
 		{
diff --git a/source/games/duke/src/funct.h b/source/games/duke/src/funct.h
index 215c8e332..567023817 100644
--- a/source/games/duke/src/funct.h
+++ b/source/games/duke/src/funct.h
@@ -221,7 +221,6 @@ bool setnextmap(bool checksecretexit);
 void prelevel_d(int g);
 void prelevel_r(int g);
 void e4intro(const CompletionFunc& completion);
-void clearfrags(void);
 void exitlevel();
 int enterlevel(MapRecord* mi, int gm);
 void donewgame(MapRecord* map, int sk);
diff --git a/source/games/duke/src/gamedef.cpp b/source/games/duke/src/gamedef.cpp
index cc14ea3c1..6f847e4a2 100644
--- a/source/games/duke/src/gamedef.cpp
+++ b/source/games/duke/src/gamedef.cpp
@@ -77,7 +77,7 @@ public:
 	const char* GetChars() { return text; }
 	int compare(const char* c) const { return strcmp(text, c); }
 	int comparei(const char* c) const { return stricmp(text, c); }
-	labelstring& operator=(const char* c) { strncpy(text, c, 64); text[63] = 0; }
+	labelstring& operator=(const char* c) { strncpy(text, c, 64); text[63] = 0; return *this; }
 
 };
 
@@ -471,7 +471,7 @@ int ConCompiler::keyword(void)
 
 void ConCompiler::getlabel(void)
 {
-	long i;
+	int i;
 
 	skipcomments();
 
diff --git a/source/games/duke/src/gameloop.cpp b/source/games/duke/src/gameloop.cpp
index 1c82f9fa7..a26d45b66 100644
--- a/source/games/duke/src/gameloop.cpp
+++ b/source/games/duke/src/gameloop.cpp
@@ -38,9 +38,6 @@ Modifications for JonoF's port by Jonathon Fowler (jf@jonof.id.au)
 
 BEGIN_DUKE_NS
 
-void GetNextInput();
-
-
 //---------------------------------------------------------------------------
 //
 // abstract the queue's implementation
diff --git a/source/games/duke/src/gamevar.cpp b/source/games/duke/src/gamevar.cpp
index 1198f0fea..5819ac1dd 100644
--- a/source/games/duke/src/gamevar.cpp
+++ b/source/games/duke/src/gamevar.cpp
@@ -442,7 +442,7 @@ bool IsGameEvent(int i)
 {
 	if (i<0) return 0;
 	if (i>=MAXGAMEEVENTS) return 0;
-	return (apScriptGameEvent[i]!=NULL);
+	return (apScriptGameEvent[i] != 0);
 }
 
 //---------------------------------------------------------------------------
diff --git a/source/games/duke/src/player_r.cpp b/source/games/duke/src/player_r.cpp
index b78559ea1..ee9dcd2d1 100644
--- a/source/games/duke/src/player_r.cpp
+++ b/source/games/duke/src/player_r.cpp
@@ -1774,7 +1774,7 @@ static void onMotorcycle(int snum, ESyncBits &sb_snum)
 	}
 	else if (p->MotoSpeed >= 20 && p->on_ground == 1 && (p->moto_on_mud || p->moto_on_oil))
 	{
-		short var9c, vara0, vara4;
+		short var9c, vara0, vara4=0;
 		var9c = p->MotoSpeed;
 		vara0 = p->getang();
 		var84 = krand() & 1;