Harry Potter: It seems, despite your exhaustive defensive strategies, you still have a bit of a security problem, Headmaster.
In both the books and the movies, Harry's Invisibility Cloak can always be seen until it is worn. In Diagon Alley, just before the Gringott's break-in, Ron pulls out the cloak to cover Harry and Griphook, but it turns invisible before he puts it on them. Ron merely mimes the motion of covering them. See more...
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The entry you are marking as a duplicate is:
|Title||Harry Potter and the Deathly Hallows: Part 2|
|Original entry||When Nagini (the snake) is moving down the stairs to attack Ron and Hermione, it lunges from midway down the stairs, under the archway. After intercutting a shot of the duel between Voldemort and Harry, Nagini is lunging from the ground, far away from the staircase and the archway.|