In the subtitles of Hitler's rant, he refers to Daffy as a "Non Aryan Duck". This fits in with filmmaker Greg Ford's account that actor Mel Blanc confided that Daffy is supposed to sound "Jewish" as opposed to Sylvester's "Gentile" voice.
Vitaphone production reel #1156A.
This Marks Daffy Duck's Final Appearance in black and white.