The very first pub the drinking party enter is called The First Post. While this is a common name for a British pub, within the confines of the film it carries another meaning. Put more specifically, it refers to the pubs status as the first stop on their crawl.
The fact the pubs seem to have been renovated and somehow all made the same is a sly crack at British pub culture, more specifically the J.D. Wetherspoons chain. For those unfamiliar with Wetherspoons, their business plan involves finding old pubs and adding them to the chain, whether this means renovating an abandoned one or buying one from its existing owners. While this works as a business exercise and a way to keep multiple pubs running, an unfortunate upshot of this mass buy-out is that multiple pubs once with their own character and culture have become part of a unified, interchangeable whole. This explains the Starbucking reference a dig at corporate culture, as well as explaining why The First Post and The Old Familiar look the same.