What makes the scene a comedy are the cartoonish and exaggerated events that take place in it.
In the scene quoted in the question, Little Tramp (Charlie chaplin) dreams of having a nice, furnished house. In this house, he has plenty of food and the plants go to his window to bring fruit, as well as a cow walks to his door and provides milk, without him having to milk it.
The scene is exaggerated and caricatured and conveys the message of how people with resources lived easily, as the poorest workers provided everything they needed like fruit and milk.
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