While the guys are playing cards in the opening scene, Alex says that Elaine is depressed because her husband is taking "the girls" for Christmas. In later episodes, Elaine has a son and a daughter, not two daughters.
Louie's brother, Nick, was going to be played by Andy Kaufman's infamous alter ego, Tony Clifton, which was a stipulation Kaufman had in his contract (originally wanting him to be in 3-4 episodes that season, but producers only allowed one). Beginning on Monday, October 2, 1978, with the table read of this episode, Tony not only showed up two hours late, accompanied by two prostitutes, but he became troublesome and scoffed aloud at other cast member's lines but proudly highlighted his own. The next day it was decided that Tony had to go, and although Andy agreed, he wanted Tony to be told that it was due to his tardiness and not his conduct. The task was left to producer, Ed. Weinberger to fire Tony. Word of this coming had gotten out, which was taking place on Wednesday, October 4th, and production & studio executives began filling the audience seats, waiting to watch it happen. When Weinberger advised Tony he was terminated, Tony reacted most boisterously that studio security had to forcibly remove him. Kaufman's manager, George Shapiro, was in on the whole thing, and being present that day he hid a tape recorder which captured Tony's firing and subsequent melee and helped sneak out the camera of another person who took photographs. Shapiro still has the tape and pictures to this day. For the episode, Tony was replaced by Richard Foronjy. These series of events was later dramatized, 21 years later, in the film Man on the Moon (1999).
In the opening scene the outside of the cab garage shows clear streets (no snow). Later the same day, stock footage outside the bar Louie and Alex meet at shows deep snow drifts piled high on the side of the street. The next scene back at the garage shows clear streets once again.