Janet Waldo replaced Verna Felton as the voice of Wilma's mother, Pearl Slaghoople.
The argument and location originated in the improvisations included in the Latin-American dubbing of the cartoon. Jorge Arbizu, who dubbed Fred Flintstone (Pedro Picapiedra in Spanish) usually added bits about wanting to go to Rockapulco with Barney, and his memories of previous visits, and the things he did there; none of those were in the original scripts. Many of these situations appear here.