The finale was filmed in three parts, first the scenes with Lisa Kudrow were filmed in Los Angeles, then everybody went to London and they filmed the scenes on the street, then they filmed the dinner and other scenes in a studio in London before an audience.
The hotel where the Friends stay in this episode, the London Marriott, was the actual hotel that the cast and crew stayed in while filming.
In the closing credits, the lady sat behind Chandler on the open top bus is show creator and writer Marta Kauffman.
Although Lisa Kudrow was really pregnant, she was still wearing padding when the episode was filmed to make her seem larger.