Often a stroke is most likely to affect one side of the body more than the other.
This can be seen in the face but it is also noticeable in the way that it can affect the arms. Ask the patient to lift their arms, or try to do so yourself.
What you may notice is that one side is easy to lift and the other appears limp. Often this is once again accompanied by numbness on that sign and usually, it will be the same side that the face is affected on.