Actress Megan Mullally injured her knee shortly before the season premiere, and was unable to walk without crutches. But because her part in this episode was so important, the producers decided at the last hour to put her in a cast and a motorized scooter, with the excuse that Karen Walker just had surgery to separate her webbed toes.
Two different versions aired, one for each coast/time zone, each with subtle differences.
This was a live-aired episode
Because this was shot live, stage directions can sometimes be heard, such as Alec Baldwin being cued to enter the apartment (in the 14th minute in the syndicated version), and especially in minute 19 (probably director Jim Brooks) cuing Debra Messing {"GO!") to enter the living room.