First of all, even though Hoosiers was based on fact, it's still a movie!!! Don't take what you see literally.
As to your questions - under NF rules, a coach (or player or bench personnel) can be ejected on a single technical if the official rules the offense was flagrant.
As to a fan coming down from the stands, you should ask game management to remove him or her. You can issue a bench technical if you feel anyone on the bench incited the behavior.
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Yom HaShoah
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