Index: src/autoreplace_cmd.cpp
===================================================================
--- src/autoreplace_cmd.cpp	(revision 22836)
+++ src/autoreplace_cmd.cpp	(working copy)
@@ -731,7 +731,7 @@
 	GroupID id_g = GB(p1, 16, 16);
 	CommandCost cost;
 
-	if (!Group::IsValidID(id_g) && !IsAllGroupID(id_g) && !IsDefaultGroupID(id_g)) return CMD_ERROR;
+	if (Group::IsValidID(id_g) ? Group::Get(id_g)->owner != _current_company : !IsAllGroupID(id_g) && !IsDefaultGroupID(id_g)) return CMD_ERROR;
 	if (!Engine::IsValidID(old_engine_type)) return CMD_ERROR;
 
 	if (new_engine_type != INVALID_ENGINE) {
Index: src/network/network_command.cpp
===================================================================
--- src/network/network_command.cpp	(revision 22836)
+++ src/network/network_command.cpp	(working copy)
@@ -308,7 +308,7 @@
 	if (!IsValidCommand(cp->cmd))               return "invalid command";
 	if (GetCommandFlags(cp->cmd) & CMD_OFFLINE) return "offline only command";
 	if ((cp->cmd & CMD_FLAGS_MASK) != 0)        return "invalid command flag";
-	if (callback > lengthof(_callback_table))   return "invalid callback";
+	if (callback >= lengthof(_callback_table))  return "invalid callback";
 
 	cp->callback = _callback_table[callback];
 	return NULL;
Index: src/order_cmd.cpp
===================================================================
--- src/order_cmd.cpp	(revision 22836)
+++ src/order_cmd.cpp	(working copy)
@@ -727,10 +727,10 @@
 		case OT_CONDITIONAL: {
 			VehicleOrderID skip_to = new_order.GetConditionSkipToOrder();
 			if (skip_to != 0 && skip_to >= v->GetNumOrders()) return CMD_ERROR; // Always allow jumping to the first (even when there is no order).
-			if (new_order.GetConditionVariable() > OCV_END) return CMD_ERROR;
+			if (new_order.GetConditionVariable() >= OCV_END) return CMD_ERROR;
 
 			OrderConditionComparator occ = new_order.GetConditionComparator();
-			if (occ > OCC_END) return CMD_ERROR;
+			if (occ >= OCC_END) return CMD_ERROR;
 			switch (new_order.GetConditionVariable()) {
 				case OCV_REQUIRES_SERVICE:
 					if (occ != OCC_IS_TRUE && occ != OCC_IS_FALSE) return CMD_ERROR;
Index: src/vehicle_cmd.cpp
===================================================================
--- src/vehicle_cmd.cpp	(revision 22836)
+++ src/vehicle_cmd.cpp	(working copy)
@@ -524,10 +524,11 @@
 
 	CommandCost cost(EXPENSES_NEW_VEHICLES);
 	VehicleType vehicle_type = Extract<VehicleType, 0, 3>(p1);
-	uint sell_command = GetCmdSellVeh(vehicle_type);
 
 	if (!IsCompanyBuildableVehicleType(vehicle_type)) return CMD_ERROR;
 
+	uint sell_command = GetCmdSellVeh(vehicle_type);
+
 	/* Get the list of vehicles in the depot */
 	BuildDepotVehicleList(vehicle_type, tile, &list, &list);