I once opened a drawer and discovered the seller's net sheet sitting on top of her comparative market analysis, in plain view. It clearly indicated a lower price was expected, so you can guess what my buyer offered.
I've also shown vacant homes where the mail was tossed all over the floor in the entryway. Neither the seller nor his listing agent bothered to stop by and pick up the mail. It wasn't hard to figure out that much of the mail contained collection notices. If a buyer was armed with that information, guess what price the buyer would be thinking about. It wouldn't be list price.
Wedding photos might give away the seller's religion, as do certain religious artifacts left in the home. Buyers can be prejudiced. Don't give buyers a way to form any opinion about you at all. Don't let buyers form ideas about you from the type of music you like or the literature you read.
Contents of Closets
Often sellers who are separating or getting divorced feel a lot of pressure to sell quickly, especially if the partner who remains in the home cannot afford to continue to maintain it. But that is not information most sellers want to share with buyers. Yet they do. They may as well toss their wallet out the car window doing 80 on the freeway.
They do this by hanging either all men's or all women's clothing in the closet. Was it a heterosexual or bisexual involvement? Who cares? It's nobody's business, really, if a seller is dissolving a relationship. But once a buyer finds out a seller desperately needs to sell, the buyer won't make an offer anywhere near list price. So don't leave any telltale clues around that could give away your motivation to sell.
Before you put your home in the market, please, prep it: empty out drawers, stage closets and pack up anything remotely personal. If your house speaks to a buyer about you, it's probably saying the wrong thing.