From Season 2 of The Flintstones:
The Flintstones & Rubbles are vacationing in Rock Vegas, but when they find they are lacking cash to pay for their hotel, they have to work off the bill, and, oh, do they ever.
Scope out Betty & Barney's musical number near the end of the show, as Barney (Mel Blanc) does a little scattin' on "When You're Smilin'". Don't ask why Betty dyed her hair platinum blonde. I don't remember why.
I'd seen this a handful of times in syndication in the 70's, as I don't recall seeing this when NBC had rerun rights.