 This episode features the Flintstones, the Rubbles, and the Gruesomes all singing "She Said Yeah Yeah Yeah", a parody of the Beatles' song "She Loves You".After "The Flintstones" ended, the Gruesomes returned for a final appearance on the spin-off "The Pebbles and Bamm-Bamm Show" (1972) with Weirdly Gruesome voiced by Don Messick and Creepella Gruesome voiced by Jean Vander Pyl.In the episode "The Birthday Present", Wooly (Pebbles' elephantine prehistoric pet, presumably a woolly mammoth or a mastodon) takes the gift that Pebbles had bought for Wilma and buries it in the back yard.