SheepDog4Life
Natural Gray Man
No, you heard about someone (four actually) developed Bell's Palsy during the trial. There's no proof the vaccine caused it.
Correct.
Bell's Palsy has a prevalence of between 12 and 40 occurrences (depends upon the source and year) per 100,000 population.
If you enrolled 30,000 people in a study of whether they liked pineapple on pizza or not, you would expect somewhere between 3.6 and 12 of them to develop Bell's Palsy.