diff --git a/src/fragglescript/t_func.cpp b/src/fragglescript/t_func.cpp
index 7cd599b11..4670807e7 100644
--- a/src/fragglescript/t_func.cpp
+++ b/src/fragglescript/t_func.cpp
@@ -2677,13 +2677,13 @@ void FParser::SF_PlayerWeapon()
 		if (playernum==-1) return;
 		if (weaponnum<0 || weaponnum>9)
 		{
-			script_error("weaponnum out of range! %s\n", weaponnum);
+			script_error("weaponnum out of range! %d\n", weaponnum);
 			return;
 		}
 		PClassWeapon * ti = static_cast<PClassWeapon *>(PClass::FindActor(WeaponNames[weaponnum]));
 		if (!ti)
 		{
-			script_error("incompatibility in playerweapon\n", weaponnum);
+			script_error("incompatibility in playerweapon %d\n", weaponnum);
 			return;
 		}
 		
@@ -2758,13 +2758,13 @@ void FParser::SF_PlayerSelectedWeapon()
 
 			if (weaponnum<0 || weaponnum>=9)
 			{
-				script_error("weaponnum out of range! %s\n", weaponnum);
+				script_error("weaponnum out of range! %d\n", weaponnum);
 				return;
 			}
 			PClassWeapon * ti = static_cast<PClassWeapon *>(PClass::FindActor(WeaponNames[weaponnum]));
 			if (!ti)
 			{
-				script_error("incompatibility in playerweapon\n", weaponnum);
+				script_error("incompatibility in playerweapon %d\n", weaponnum);
 				return;
 			}
 
diff --git a/src/g_doomedmap.cpp b/src/g_doomedmap.cpp
index b3aa966c3..6d7ba6796 100644
--- a/src/g_doomedmap.cpp
+++ b/src/g_doomedmap.cpp
@@ -246,7 +246,7 @@ void FMapInfoParser::ParseDoomEdNums()
 	}
 	if (error > 0)
 	{
-		sc.ScriptError("%d errors encountered in DoomEdNum definition");
+		sc.ScriptError("%d errors encountered in DoomEdNum definition", error);
 	}
 }
 
diff --git a/src/scripting/codegeneration/codegen.cpp b/src/scripting/codegeneration/codegen.cpp
index 8e5750660..8948de223 100644
--- a/src/scripting/codegeneration/codegen.cpp
+++ b/src/scripting/codegeneration/codegen.cpp
@@ -7493,7 +7493,7 @@ isresolved:
 		else
 		{
 			// Todo: If this is a qualified call to a parent class function, let it through (but this needs to disable virtual calls later.)
-			ScriptPosition.Message(MSG_ERROR, "Qualified member call to parent class not yet implemented\n", cls->TypeName.GetChars(), MethodName.GetChars());
+			ScriptPosition.Message(MSG_ERROR, "Qualified member call to parent class %s::%s is not yet implemented\n", cls->TypeName.GetChars(), MethodName.GetChars());
 			delete this;
 			return nullptr;
 		}
@@ -7897,7 +7897,7 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
 					// For a reference argument the types must match 100%.
 					if (type != ArgList[i]->ValueType)
 					{
-						ScriptPosition.Message(MSG_ERROR, "Type mismatch in reference argument", Function->SymbolName.GetChars());
+						ScriptPosition.Message(MSG_ERROR, "Type mismatch in reference argument %s", Function->SymbolName.GetChars());
 						x = nullptr;
 					}
 					else
@@ -8346,7 +8346,7 @@ FxExpression *FxGetDefaultByType::Resolve(FCompileContext &ctx)
 		{
 			// this is the ugly case. We do not know what we have and cannot do proper type casting.
 			// For now error out and let this case require explicit handling on the user side.
-			ScriptPosition.Message(MSG_ERROR, "GetDefaultByType() requires an actor class type", static_cast<FxConstant *>(Self)->GetValue().GetString().GetChars());
+			ScriptPosition.Message(MSG_ERROR, "GetDefaultByType() requires an actor class type, but got %s", static_cast<FxConstant *>(Self)->GetValue().GetString().GetChars());
 			delete this;
 			return nullptr;
 		}
diff --git a/src/scripting/thingdef.cpp b/src/scripting/thingdef.cpp
index 5d2d251a9..355cc87f3 100644
--- a/src/scripting/thingdef.cpp
+++ b/src/scripting/thingdef.cpp
@@ -272,7 +272,7 @@ static void CheckForUnsafeStates(PClassActor *obj)
 				// If an unsafe function (i.e. one that accesses user variables) is being detected, print a warning once and remove the bogus function. We may not call it because that would inevitably crash.
 				auto owner = FState::StaticFindStateOwner(state);
 				GetStateSource(state).Message(MSG_ERROR, TEXTCOLOR_RED "Unsafe state call in state %s.%d which accesses user variables, reached by %s.%s.\n",
-					owner->TypeName.GetChars(), state - owner->OwnedStates, obj->TypeName.GetChars(), FName(*test).GetChars());
+					owner->TypeName.GetChars(), int(state - owner->OwnedStates), obj->TypeName.GetChars(), FName(*test).GetChars());
 			}
 			state = state->NextState;
 		}
diff --git a/src/scripting/thingdef_properties.cpp b/src/scripting/thingdef_properties.cpp
index 9eb050a83..e318a9806 100644
--- a/src/scripting/thingdef_properties.cpp
+++ b/src/scripting/thingdef_properties.cpp
@@ -525,7 +525,7 @@ DEFINE_PROPERTY(skip_super, 0, Actor)
 	if (info->Size != actorclass->Size)
 	{
 		bag.ScriptPosition.Message(MSG_OPTERROR,
-			"'skip_super' is only allowed in subclasses of AActor with no additional fields and will be ignored.", info->TypeName.GetChars());
+			"'skip_super' is only allowed in subclasses of AActor with no additional fields and will be ignored in type %s.", info->TypeName.GetChars());
 		return;
 	}
 	if (bag.StateSet)
diff --git a/src/scripting/zscript/zcc_compile.cpp b/src/scripting/zscript/zcc_compile.cpp
index c4c524817..d95e910ae 100644
--- a/src/scripting/zscript/zcc_compile.cpp
+++ b/src/scripting/zscript/zcc_compile.cpp
@@ -1323,7 +1323,7 @@ bool ZCCCompiler::CompileFields(PStruct *type, TArray<ZCC_VarDeclarator *> &Fiel
 				}
 				else if (hasnativechildren)
 				{
-					Error(field, "Cannot add field %s to %s. %s has native children which means it size may not change.", type->TypeName.GetChars(), fd->FieldSize, FName(name->Name).GetChars());
+					Error(field, "Cannot add field %s to %s. %s has native children which means it size may not change.", FName(name->Name).GetChars(), type->TypeName.GetChars(), FName(name->Name).GetChars());
 				}
 				else
 				{