Meanwhile, and Karen Walker have their own holiday subplot, and the episode features guest star Mary McDonough . The episode concludes with a heartwarming realization from Will about the difference between being "alone" and "lonely". Production Details & Trivia

Will performs an impression of from Sesame Street .

Jack nicknames Will "," a reference to former NYC Mayor Rudy Giuliani.

Grace jokes that Karen’s nose is red enough from alcohol to guide .

While most commonly associated with Will & Grace , "All About Christmas Eve" is also the title of: