I always joke that before I got married I was a yekke, and my husband says that in itself is a yekkishe vort!
Lighting candles on friday night – yes some light only 2 but because as far as I know candle lighting is the only minhag where a woman follows her mother, this is not so true any more. My mother lights for each child (and she is a proper yekke) and so do I.
You can also tell a real old yekke by their pronunciation…