diff --git a/src/gl/models/gl_models.cpp b/src/gl/models/gl_models.cpp
index 47283b51aa..fe974f4dfd 100644
--- a/src/gl/models/gl_models.cpp
+++ b/src/gl/models/gl_models.cpp
@@ -787,6 +787,10 @@ void gl_InitModels()
 							map[c]=1;
 						}
 					}
+					else if (sc.Compare("dontcullbackfaces"))
+					{
+						smf.flags |= MDL_DONTCULLBACKFACES;
+					}
 					else
 					{
 						sc.ScriptMessage("Unrecognized string \"%s\"", sc.String);
@@ -949,8 +953,9 @@ void gl_RenderModel(GLSprite * spr)
 	gl_RenderState.EnableTexture(true);
 	// [BB] In case the model should be rendered translucent, do back face culling.
 	// This solves a few of the problems caused by the lack of depth sorting.
+	// [Nash] Don't do back face culling if explicitly specified in MODELDEF
 	// TO-DO: Implement proper depth sorting.
-	if (!( spr->actor->RenderStyle == LegacyRenderStyles[STYLE_Normal] ))
+	if (!(spr->actor->RenderStyle == LegacyRenderStyles[STYLE_Normal]) && !(smf->flags & MDL_DONTCULLBACKFACES))
 	{
 		glEnable(GL_CULL_FACE);
 		glFrontFace(GL_CW);
@@ -1012,6 +1017,9 @@ void gl_RenderModel(GLSprite * spr)
 	// Model space => World space
 	gl_RenderState.mModelMatrix.translate(spr->x, spr->z, spr->y );	
 
+	// [Nash] take SpriteRotation into account
+	angle += spr->actor->SpriteRotation.Degrees;
+
 	if (spr->actor->renderflags & RF_INTERPOLATEANGLES)
 	{
 		// [Nash] use interpolated angles
diff --git a/src/gl/models/gl_models.h b/src/gl/models/gl_models.h
index f0267b8913..c37b69b5ee 100644
--- a/src/gl/models/gl_models.h
+++ b/src/gl/models/gl_models.h
@@ -370,6 +370,7 @@ enum
 	MDL_USEACTORPITCH				= 32,
 	MDL_USEACTORROLL				= 64,
 	MDL_BADROTATION					= 128,
+	MDL_DONTCULLBACKFACES			= 256,
 };
 
 struct FSpriteModelFrame
diff --git a/src/p_actionfunctions.cpp b/src/p_actionfunctions.cpp
index 518d2fb631..69ca13f164 100644
--- a/src/p_actionfunctions.cpp
+++ b/src/p_actionfunctions.cpp
@@ -5012,7 +5012,7 @@ enum T_Flags
 DEFINE_ACTION_FUNCTION(AActor, A_Teleport)
 {
 	PARAM_ACTION_PROLOGUE(AActor);
-	PARAM_STATE_DEF		(teleport_state)			
+	PARAM_STATE_ACTION_DEF	(teleport_state)			
 	PARAM_CLASS_DEF		(target_type, ASpecialSpot)	
 	PARAM_CLASS_DEF		(fog_type, AActor)			
 	PARAM_INT_DEF		(flags)						
@@ -5449,7 +5449,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Warp)
 	PARAM_FLOAT_DEF(zofs)				
 	PARAM_ANGLE_DEF(angle)				
 	PARAM_INT_DEF(flags)				
-	PARAM_STATE_DEF(success_state)		
+	PARAM_STATE_ACTION_DEF(success_state)		
 	PARAM_FLOAT_DEF(heightoffset)		
 	PARAM_FLOAT_DEF(radiusoffset)		
 	PARAM_ANGLE_DEF(pitch)				
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 2650224be4..53491f235f 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -771,7 +771,7 @@ bool AActor::GiveInventory(PClassActor *type, int amount, bool givecheat)
 {
 	bool result = true;
 
-	if (type != nullptr || !type->IsDescendantOf(RUNTIME_CLASS(AInventory))) return false;
+	if (type == nullptr || !type->IsDescendantOf(RUNTIME_CLASS(AInventory))) return false;
 
 	AWeapon *savedPendingWeap = player != NULL ? player->PendingWeapon : NULL;
 	bool hadweap = player != NULL ? player->ReadyWeapon != NULL : true;
diff --git a/src/scripting/backend/codegen.cpp b/src/scripting/backend/codegen.cpp
index c05ab6d644..71ecfc58c9 100644
--- a/src/scripting/backend/codegen.cpp
+++ b/src/scripting/backend/codegen.cpp
@@ -7863,7 +7863,7 @@ FxExpression *FxMemberFunctionCall::Resolve(FCompileContext& ctx)
 		return x->Resolve(ctx);
 	}
 	
-	if (Self->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)))
+	if (Self->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)) && !Self->ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)))
 	{
 		auto ptype = static_cast<PPointer *>(Self->ValueType)->PointedType;
 		if (ptype->IsKindOf(RUNTIME_CLASS(PStruct)))