Glagolitic alphabet
The exotic looking alien script seen in several places in this movie is actually the real Glagolitic alphabet. The name of the alien leader - Cyrillus - bears a resemblance to Saint Cyril, who invented the Glagolitic alphabet. Also, the language spoken by the aliens (which is never translated in the movie) is the Walloon language, a real dialect from Belgium, where the movie was produced. It is completely unrelated to the Glegolithic script. On the approach of the manned probes to the surface, the coastline appears to be that of California. The outdoor shots of the theme park are from a real French theme park, "Parc Du Futuroscope".