To me, the interesting part is that there is no "Apple Menu", just a purely decorative Apple logo in the center of the menu bar.
The other trick is that the beta expired in (IIRC,) May, 2001. So you have to make sure you set your clock to a date BEFORE that, and turn off automatic date and time setting, or else the next time you boot it, it will reset the date to the correct date, and refuse to continue booting.

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Ahh, is it not a menu? I had always assumed that the central Apple was a menu but just in the centre. Where are About this Mac, Shut Down etc on the Public Beta then? What happens to it if you open an application with a lot of menus, does it move to the right, disappear etc?

I do actually have one of the Public Beta sets (I thought £3 including postage for that and a copy of “OS X 10.0 instant-up-to-date” together was a deal worth taking – that is 10.0 but in the slim folder instead of the retail box, not really sure what that is, maybe if you bought a new mac just before they started shipping 10.0 with Macs you could order one cheap?) but haven't ever installed it as I don't want to screw up my G3 and it won't run in any emulators. The packaging and documentation included is very similar to the OS X up-to-date or the OS X 10.1 upgrade pack if you've seen one of those.