When the Bundies come out of the London airport, their baggage is placed in the trunk of the limo. Later when they come out of Harrods with all their shopping, the limo's trunk is empty.
Near the beginning - when Peggy had announced the family had won the trip to England, Kelly was like "What's England?" (she had no clue about the country). But then, just a few minutes later when Bud was talking about getting British babes, Kelly jokes to him - "Just remember that the inflatable ones blow up on the LEFT side..." (referencing where the cars drive). Clearly, she knew what England was there.
Al Bundy's portrayal as a shoe salesman implies that he is a loser in a lowly dead end poorly paid occupation. His ancestor, Seamus McBundy, is portrayed as a blacksmith making horse shoes. This suggests that there is a long family historical connection with shoes, implying similar social status. But, in 1653, a blacksmith was a highly valued trade of critical importance to a village, often earning a relatively comfortable living for the time period.