Sheriff Jim Alderman says his investigators believe there was no hoax, but will seek a new interview with the family after the CNN broadcast to clarify the statement.
During an ABC interview, Falcon Heene said Friday: "Mom, I feel like I'm going to vomit." He then left the room with his mother and could be heard gagging.
During a live interview on NBC shown simultaneously on Friday, Falcon threw up into a container when his father was answering the same question.
Photos: The "Balloon Boy" Incident
Falcon vanished around the time that a homemade helium balloon floated away from his home, setting off a national uproar as authorities scoured the plains of northern Colorado for the youngster.
Richard Heene, Falcon's father, told CBS' "The Early Show" Friday, said his son's comment about "a show" was in reference to a camera crew that had asked Falcon to reenact him climbing into the attic.
The discovery marked a bizarre end to a saga that started when the giant silvery balloon floated away from the family's yard Thursday morning, sparking a frantic rescue operation that involved military helicopters and briefly halted some departures from Denver International Airport.