Two Nazis for the Price of One - S3-E17
Corrected entry: 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.
Funny Thing Happened on the Way to London - S3-E5
Corrected entry: When Hogan goes to shake hands with Baumann, he grabs and raises Baumann's arm to make the wrist gun fire upwards. As it fires, it takes Klink's hat off. Upon inspection, Klink's hat has only one hole, as if fired through from underneath. The gun fired at the peak of the hat, therefore, there should be a second hole about the level of the top of the eagle on the front of the hat.
Correction: That is not a continuity mistake. The extra piece would have been affixed (glued) to the large swastika antenna before mounting, not when Hogan bent the poles into shape. Just because it wasn't shown as added does not make it a continuity mistake. It was added off camera and in another time frame.