Yes, the details can make a difference.
But they won’t do you a lick of good unless you get the big picture right first. In fact, all the details should point in the same direction – towards optimizing the customer experience.
Whatever your online business, you won’t be remembered for moving that image from the right side of the page to the left side. You won’t be remembered for the size or font of your headlines either.
But what every visitor and customer will remember is the quality of the experience they had at your site, whether they have made a purchase yet or not.