Warning lights and pressure-sensitive emergency stop systems were installed to alert operators if anyone was in a hazardous area.

: As the stage began its transition (which occurred every 2 to 4 minutes), Stone either fell, stepped backward, or attempted to jump from one stage to another, becoming trapped in a narrow gap.

Stationary walls were replaced with panels designed to break away under pressure.

Deborah Stone was a recent high school graduate working a summer job at Disneyland's newly opened "America Sings" attraction. The ride featured a rotating outer ring of six theaters that moved around a stationary central stage.

Despite the efforts of law enforcement, the case remained unsolved for many years. However, in 2005, a significant break in the case was made when DNA evidence was re-examined using advanced technology. The DNA results led investigators to a suspect, who was subsequently arrested and charged with Stone's murder.