The last episode to feature a viewer letter.
Crow's line "Please, please, if could you keep all your 'rhubarbs' to a minimum!" is a reference to walla, the recorded sound effect that's meant to sound like the indistinct murmur of a crowd. Saying "rhubarb" is a common line spoken by actors when recording for walla.
This episode is on the Volume 37 DVD Box Set of Mystery Science Theater 3000.