Look at Ron and Hermione’s hands in the photo above (at the top, on the right side). That’s another detail from the novel that they got right! 🙂
Ron had a fit of gallantry and insisted that Hermione sleep on the cushions from the sofa, so that her silhouette was raised above his. Her arm curved to the floor, her fingers inches from Ron’s. Harry wondered whether they had fallen asleep holding hands. The idea made him feel strangely lonely.
–Harry Potter and the Deathly Hallows, page 176.