When viewing a house. Try to keep focused on the home and not on the sellers furniture. If children are with you, try to keep them from playing with the Seller's childrens' toys. Try not to spend time with the Seller's pet. Remember you are there to see if the house is right for you.
Silence is golden.
Be courteous but don't force conversation with the potential seller. They want you to inspect their house not pay a social call. Be it ever so humble. Let the trained salesperson ask most questions. They are experienced at it.