Recently I've watched Harry Potter and the Deathly Hallows: Part 1 again and a little piece of something made me curious. It's definitely thin enough for being a laptop (display), it's tilted like a laptop display (> 90° angle) and the most interesting - it doesn't look like a chair mainly because there are already two chairs (under the green lines). None of them look at least a little bit similar to the object under the red arrow.
The scene is right after another Harry(George) with an ear cut off came with Remus to the Burrow and entered the house. The hand belongs to Molly Weasley.
So, is that object a laptop, or something similar that somehow got into the movie? If yes, was it an accident or was it in the book? I do remember stuff from the books, but I don't believe Arthur had a laptop, nor I remember Rowling describing one in the Burrow.