These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The German slang word "gummi", which means "condom".
Many references to history and philosophy ("You, Kant, Always Get What you Want," and the deleted scene with Yitzhak's drag character, Krystall Nacht, as just two examples), and little German references in the lyrics ("sweet home Uber Alles!").
Tear Jerker: Almost every time a song involving Tommy and Hedwig in the same scene is going to be pretty emotional.