In one episode, there was an Italian contestant, Giuseppe Iannello, who was also a fan of the show's Italian version (Affari Tuoi, literally Your Business). So what happened? Howie surprised him with a via-satellite greeting from their then-host of Affari Tuoi, Flavio Insinna, who wished him good luck. The catch? Flavio was in his own version of the show's studio!
In the UK version a contestant wanted to win money to travel to America to track down his sister who he lost contact with decades ago. All he had was a picture of her walking down an unknown street in new york. It turned out the street was in the financial district and thus the Banker actually gave the street name as part of the deal to help the contestant find his sister.