FFF, Understood - these are just distractions to test your ability to multitask and to 'keep flying the a/c'. Up to the examiner how he does it. I guess he wouldn't say 'Oh dear, my camera has jammed solid under this rudder pedal and now I've got heart palpitations...'? That's a bit more than a distraction and it isn't covered in training (go on tell me it could happen). How bizarre could they be in the limited time.
Anyway, I assume they are not out to fail you - you get briefed and you wouldn't be up for it if your instructor hadn't got you to consistently demo the text book practice emergencies.