Lyric discussion by Mark Kanges 

Cover art for Brown Derby Jump lyrics by Cherry Poppin Daddies

...a nightmare straight from an Otto Dix...

It is "an" and not "the". Otto Dix was a German painter noted for his often grotesque renderings of war. I think this line is there to link the song to the era of the 1930's when Brown Derbies, Swing music, and Art Deco was fab,

My Opinion