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Stupidity: There's no explanation for the level in Italy; Billy and Jimmy have already all the three stones by the end of the Japan battle and they need then to go to Egypt. The NES version does explain it, in a laughable way; Hiruko says a rather silly "We must now travel to Egypt to free Marion, but before we do, we must spend time in Italy, practising for the big battle", Technically the NES version has a different storyline, since Marion is not missing at all in the other versions.

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Factual error: In the Arcade, the map marker at the beginning of each stage is all wrong, being too far right - the US level starts somewhere off Nova Scotia, the Italian marker is in the Black Sea, etc. Home versions mostly fix it, but not quite; the Italian level in the Amiga version would be in France and the Egypt final stop is more like in Algeria.

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Character mistake: In the arcade version, before entering the door with the three stones, Hiruko says "There is a secret hidden beneath HEAR, go."

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