The song "Just One Person" from this musical was one of the late Jim Henson's favorite songs and was once performed on the Muppet Show as well as during Henson's memorial service.
The "clouds" section of the special was a more elaborate take on the opening scene in "A Boy Named Charlie Brown."
This is the second special after You're a Good Man, Charlie Brown (1985) where Snoopy talks. The last time he talks was in The Music and Heroes of America (1989).