Från IMDb :
Putting the Alien (1979) skull on the trophy case on the Predator ship was the idea of Stephen Hopkins' as a way of showing off all the different species and creatures that the Predators have hunted and killed. It was also a nod to the Dark Horse Aliens vs Predator comics which were quite popular at the time. Since Fox had owned the Alien film series, it was easy to obtain the rights to use the Alien head in the film. This excelled popularity of the Aliens vs. Predator series crossover throughout the 1990s, and was promptly followed by more comic books, novels, video games, toys, and eventually movies.
Alien och Predator-serierna publicerades från omkring 1989, men "Alien vs Predator" publicerades inte till februari 1990, samma år som Predator 2-filmen. Så med andra ord är filmen ett nöje till serierna, men jag tvivlar verkligen på att det fanns allvarliga planer på att göra en "AvP" -film då.