Audi here not BMW but I don't see them as having soft clear coats. On pure black like mine and I suspect most, you'll definitely "see" imperfections more easiliy.
As already noted, I would suspect what you're seeing was either caused by product removal when you completed the detail and perhaps had some oils masking them. Or more likely you marred it up when drying.
I always blow dry - especially nice on a coated car, then NEVER touch the car with a dry microfiber. I don't even use detail spray and a dry MF rag. Anything that touches my car will be dampened with some Uber Rinseless wash and wrung out completely. I will spritz on some of my "blue juice" frankendetailer made up of ECH20 / Reload and Distilled Water, but even there, I will wipe it off with a damp cloth. No buffing needed.
I find the above keeps my car in perfection mode.