Anyone ever notice...

I was just watching the movie again for the gazillionth time and I've been wondering if anyone else has ever noticed that the woman in the red sequined dress wearing a tiara and stuffing her face in the wedding reception scene was also in The Producers, wearing the exact same outfit, as a member of the audience in the Springtime for Hitler show scene?

I kept thinking that maybe they were filming both movies at the same time and they used the formally dressed wedding guests from one movie as the Broadway show audience in the other, but The Producers was released in 1967. Oh well.