I remember watching the spy series Scarecrow and Mrs King in the 80's.
A few times during the series there was like a dinosaur film being shown on TV screen, big lizards fighting each other.
It wasn't one million years BC but seemed the same kind , I've looked at odd clips of "creature features" on YouTube but never identified.
Was it something they just invented for the Scarecrow series?
I never saw the first few episodes so possibly I missed out on a running gag thing