The bad guys have a "silenced" revolver which is not possible as shown because the gases will exit around the barrel versus being compressed and thus silenced. There are a couple revolvers that are silenced but they are highly specialized and do not look like what is shown.
There is a roadway sign in middle of road informing of scene being filmed where the vintage cars are shown avoiding it on quick cut, happens during shooting sequence near end.
During vintage cars in dirt road near ending scene - Sabrina opens the car door as some yellow script paper comes flying out the door.