Any changes to the agreement of sale by either party has to be initialed and dated by all principals in the transaction. If the seller changed the agreement, initialed and dated it, then you must also initial and date the changes. Otherwise, there is no agreement. There is no contract.
Also, if you are financing the transaction with a mortgage, I would bet that most lenders would not permit the financing of furniture and personal property as part of the home purchase transaction. I always advise my buyer and seller clients never to include personal property, furniture, etc. in the sale or purchase of a home for that reason.
Good Luck with your home purchase.
Keller Williams Real Estate
Exton, PA 19341
Office: (610) 363-4300
Cell: (484) 948-0936