Find the Mistake | Hard Picture Puzzles

It contains the hard picture puzzles which will test your observation brain power. These tricky picture puzzles contain puzzle images which have one mistake in it. Your challenge is to find this mistake in each of the puzzle images.
Answers of these find the mistake picture puzzles are given in this puzzle video. However, there is one bonus find the mistake puzzle for which the answer is not provided. Post your answer for this "find the mistake picture puzzle" in comments.

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