Mickey Rooney as the understudy performing all the roles in a murder mystery play.
Mel Torme sings "Blue Moon", sings medley with Steve and June.
June Christy sings "Midnight Sun".
The Nutty Squirrels in squirrel costumes, singing like The Chipmunks, do their novelty hit "Uh! Oh!"
Also: The Nutley/Hinkley/Butley/Winkley Report with Dana (Jose Jimenez) teaching Santa school, Rooney writing Christmas songs,
and Knotts as a bell ringer. Nervous Knotts is a speaker at a medical convention who takes tranquilizers during his speech and dozes off.