21Horace Slughorn
In Harry Potter and the Half-Blood Prince, while Horace Slughorn is disguised as an armchair, you can visibly see his feet.
22Horcrux Cave
When Dumbledore visits a young Tom Riddle in Harry Potter and the Half-Blood Prince, there is a picture of the cave where Tom hid one of his Horcrux. There is also a brief close up that shows 7 rocks meticulously organized on Tom’s windowsill, foreshadowing Voldemort’s plan to split his soul into seven Horcruxes.
