This is why a trial flight or whatever you want to call it is so much fun.
You can make it as narrow or as broad as you like in its content.
A few instructors just get a bit hung up on how, if any, pre brief should be done...it depends on the person receiving the flight, the type of aircraft, etc.
Its the legal eagles worrying that they are breaking some law not giving a brief? Use a bit of common sense.