Goof: After the time machine's inventor gets the Flintstones and Rubbles back to the Bedrock World Fair and he asks them what happened, his outfit is a darker shade of blue, then changes back to its lighter shade as before.
(The Flintstones and the Rubbles finally come back to their own time and immediately run out of the time machine)
Inventor: Hey! What happened?
Fred: Oh, nothing, except we were chased by lionosauruses, clobbered by Columbus, shocked in Philadelphia, trampled on, screamed at, and if that's how your time machine works, you can have it, buddy!
This episode was recorded on 6-15-64.
Nero is pictured resembling and having the mannerisms of another famous fiddle player: Jack Benny.