Film to Reveal Origin of Jitterbug

I was playing with Google News Reader again, and came across this writeup from The Pittsburgh Press, Dec 23, 1943.

Film to Reveal Origin of Jitterbug

HOLLYWOOD -- Filming of "Jitterbugs," Pete Smith Speciality designed to show how the art of "jitterbugging" developed, will get under way soon, with Will Jason directing.

The short subject boasts a cast of five women and three men, including Arthur Walsh and Jean Phelps, Lennie [sic] and Kay Smith; Charles Saggau and Irene Thomas; and Dorothy Ford and Betty Lou Walker.

Groovie Movie (1944)

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I've never heard of Dorothy Ford & Betty Lou Walker before (I'm guessing Dorothy Ford is this gal?). I wonder what their roles were supposed to be?