Continuity mistake: When Hogan is bending the antennae into a swastika, there are no extra pieces; all the bends are smooth. When it's on the flagpole/antennae, there is a short, extra piece under it to attach it to the mast.
When Klink is begging Hogan to trade places with him for fear of assassination, he says to him something like."I want to live til 80...all my family has lived til 80." Werner Klemperer, who played Klink, passed away in 2000 aged 80.