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Opening and closing cabin doors and their use as emergency exits. Not leaving seat belts outside. Where not to step and what to hold on to. Sharp objects must be handled carefully when working with float-equipped helicopters.

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Hazards of rotor blade sailing and walking uphill inside the rotor disc with rotors running.

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When they can smoke (not when oxygen is in use!).

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Avoidance of flying when ill or drunk—this is dangerous to themselves, but if they are incapable next to an emergency exit, others could suffer too.

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How to use the seat belts and when they must be fastened.

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What not to touch in flight.

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Loose articles, stowage (tables, etc.) and dangers of throwing anything out of the windows or towards any rotor blades.

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Use and location of safety equipment, including a practical demonstration (if you intend to reach a point over 30 mins away from the nearest land at

overwater speed, do this with the lifejacket).
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The reading of the passenger briefing card, which should be of at least Letter or A4 size, so it doesn't get lost in a pocket. It should also be as brightly coloured as possible, so it catches the eye. Particular things to place on this card that always seem to be forgotten include instructions not to inflate lifejackets in the cabin and full door opening instructions (don't forget any little bolts that may be about).

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The brace position (including rear-facing seats). If you ever have to give the order to adopt it, by the way, don't do it too early, otherwise the passengers will get fed up waiting for something to happen and sit up just at the point of impact.

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Landing areas should be clear.

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No-one in the cabin when slinging, or on the long-line.

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How long the flight will be, and how high you will be flying, what the weather will be like.

Get everyone’s names and have them sign something. You might want to adapt this sample brief:
"Welcome aboard this flight. I am the commander and I must ask you to take notice of any instructions you may be given by myself or my crew, and this includes any given by means of signs. If I have to land quickly or in an emergency, I will tell you in enough time for you to prepare.
Emergency exits include the window there and the door by which you came in. Full instructions for each are on the briefing card, which I would like you to read thoroughly, as it gives further instructions for the lifejacket, should it be required, under your seat. Other emergency equipment includes fire extinguishers which are there and there, and the First Aid kit there. The Emergency Locator Transmitter is here, with the On switch marked.
For take-off and landing, please ensure that all loose articles are stowed away. You may not smoke, and please do not throw anything out of the windows."