One way to fix a loose screw in wood is to remove it and then insert toothpicks or burned wooden matches with a coating of wood glue into the hole. Allow the glue to cure, then cut flush and re-drive the screw. You can also insert a plastic wall anchor into the screw hole. When you put the screw back in, it will expand the anchor and will hold solidly.
In addition to comparing the home to your minimum requirement and wish lists, consider the following: Is there enough room for both the present and the future? Are there enough bedrooms and bathrooms? Is the house structurally sound? Do the mechanical systems and appliances work? Is the yard big enough? Do you like the floor plan? Will your furniture fit in the space? Is there enough storage space? (Bring a tape measure to better answer these qusetions) Does anything need to be repaired or replaced? Will the seller repair or replace the items? Imagine the house in good weather and bad, and in each season. Will you be happy with it year? Take your time and think carefully about each house you see. Ask your real estate agent to point out the pros and cons of each home from a professional standpoint. Using a scorecard to keep track of the homes you see is a great way to keep organized.