Love is in the Airplane - S8-E6
Factual error: When Will and Grace are in the Heathrow terminal, you can see that there are signs which use American terms instead of the British words that would be used; such as "Restrooms" and "Food Court". (00:18:30)
Answer: A history of the game can be found at http://www.fast-rewind.com/bacon.htm.
J I Cohen