I have trawled the net to find another account of this easter egg, but so far drawn blank.
It was something I used to do when I had my
ZX Spectrum plus, if you got to the point of getting 1000 lines, in the following playtime in the game you go as far left of the screens as you can then hold down symbol shift and the letters 'S' 'A' 'M' and if you do this right,
Sam Cruise from a previous Microsphere Game will appear in the Toilets ( the white room ) he stays static and disappears when you walk right and the screen scrolls to the middle.
I have managed to emulate this on my PC and grabbed the moment after hours of playing, and fiddling with the controls.
The Man in the toilet is from 'Contact Sam Cruise' and is not a character in this Game!
I sent this into
Your Sinclair in 1989 but did not get a reply, it has always been assumed that it was common knowledge as a few of us at School did this but funnily enough we called him the Dirty old man! not knowing that he had his own game.
I hope that a reader can cast some new light on this bug in the game.
Happy Easter!.