Due to music clearance issues, some of the episodes on the DVD sets of the show are edited. Some sketches simply have music replacements, while a few sketches had to be trimmed to exclude certain musical performances by the cast (such as Andrea Martin as Edith Prickley singing a line from "Whistle While You Work" in a sketch, or Catherine O'Hara as Dusty Towne and Rick Moranis as Merv Griffin having to cut out various songs they perform in their sketches). As of Volume 3, none of the actual guest musical performances have had to be cut. As of Volume 3, the only full sketch to be cut is "Stairways to Heaven;" A Compilation Album of various artists performing "Stairway to Heaven" - Led Zeppelin refused clearance of their song.