I think an early computer network has come up as a news item in one of the eras. But that's still a leap to the concept of the internet as we know it. You're saying that "Pretty Ballerina" is the answer song to "Mindrocker"? It looks like "Mindrocker" is first released as the B-side of "Bend Me, Shape Me" in October 1967--nearly a year later. More likely "Mindrocker" was referencing "Pretty Ballerina," or just using coincidental phrasing.