The scene of Meg Ryan seeing the Cowboy in the tub.
This was beautifully constructed. Picardo, the actor playing the Cowboy, is shown talking to Meg Ryan..... She backs away slowly, into the bathroom, and sees the Cowboy's other body in the tub. All one single take.
Unless that actor has a twin brother, i believe they cunningly had the 1st Picardo back out of the shot, then hidden from camera, remove all his clothes, run through a hidden backdoor on the set leading to the bathroom, and jump into the tub.
These days, doing this with CGI would've been a snap.... But it was fantastic to see a completely effective shot done practically, with real life elements.