June Foray, the voice of the "Talky Tina" doll, was also the voice of Mattel's "Chatty Cathy" doll, upon which the doll in this episode was based.
According to The Twilight Zone Companion, this episode was written in one day by Jerry Sohl, even though credit was given entirely to Charles Beaumont.
Tina and Christie are both nicknames for Christina. The doll and the child share a name, so among many other interpretations it could be argued that the doll is a proxy through which Christie expresses hostility toward her stepfather and protects her shy, frightened mother.
The child actress who portrays Christie is credited as being the voice of "Lucy Van Pelt" in the classic TV special, "A Charlie Brown Christmas".