it has two Street address fields and indicates what kind of information should be input in each one (Flat number goes to the second field)
Case Study: Inconsiderate User Interface inflicts financial losses
Paris Kasidiaris

They could make it even better by including these clues as a label or inline description rather than as a placeholder. Numerous studies suggest that this further improves clarity of purpose of form fields, since placeholders vanish when you start inputting data in the field. I found a number of great articles about form design in ecommerce here: (oldie but goodie).

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