One of the themes of Dracula is “don’t be deceived by outward appearances” select two details from the text to support the theme

20 July.--Visited Renfield very early, before attendant went his rounds. Found him up and humming a tune. He was spreading out his sugar, which he had saved, in the window, and was manifestly beginning his fly catching again, and beginning it cheerfully and with a good grace.

I looked around for his birds, and not seeing them, asked him where they were. He replied, without turning round, that they had all flown away. There were a few feathers about the room and on his pillow a drop of blood. I said nothing, but went and told the keeper to report to me if there were anything odd about him during the day.