When Freddie arrives late in the pub, he pays his companions' bill and tips generously. In a British pub, you pay for each drink as you buy it, rather than running up a bill to be settled later. Also, tipping in British pubs is almost unknown. However, this appears to be a London wine bar, not a pub, where restaurant-style paying is normal.
George is generally very punctilious, and appears to be an accomplished and precise chef. But when he chops garlic, his knife is not sharp enough to completely cut through the clove, something an excellent cook would not tolerate.