No, there is not an emergency hood release. There just the normal hood release which is locate on the driver's side kick panel below the dash. Pull handle to release hood and pull safety latch and open hood.
There is no emergency hood release for the BMW 335i that I can find. I contacted BMW and was told that there is no reason for there to be one so one wasn't included.
I have never heard of an emergency hood release. There should be two on any newer car. On inside to pop the hood and a safety latch at the front of the hood to keep the hood from flying open while driving.
Is it possible you are referring the the emergency trunk release? If so all newer vehicles are equipped with this feature and it is usually a bright neon color.