In the event that the inspector discovers something

In the event that the inspector discovers something that is outside his scope of service or expertise, like a crack in the chimney, he will advise that you contact a specialist to look further into that particular situation.
The physical inspection is usually a contingency of the sale. Say, for instance, that the inspector discovers that the front door squeaks. The buyer then has to think about how important that is to him. The buyer then has several options - he can say that there is no way that he can live in a house with a squeaking door and so he can back out of the deal or he can ask the seller to repair the squeak.