Hail and farewell!
This being 1938 I'm surprised the Marx Brothers and Lucy Ball would use a Nazi-reminiscent gesture other then to mock politics. The boys and Lucy too were all strongly anti-fascist. Of course the scene was totally apolitical but in context of the time it's a bit on the nose. Lucy especially does it perfectly.
http://chorribobadas.files.wordpress.com/2011/03/room02.jpg