Offhand, knowing only what you're sharing here (and I'm assuming, hopefully correctly, that by Army of Darkness you mean that the marooned pilot will introduce technology against some evil magical regime)...I would think an advanced species as the pilot escaped from would recognize magic worlds and have some way to identify and even explain them (not that their explanations are necessarily true), and if militant (which they sound, and militant isn't necessarily a bad thing if you live in a hostile universe) then they would want to study such phenomenon, and replicate it if they can. (Star Trek sort of explored this concept, from planets with unique conditions that couldn't be replicated elsewhere--save other "unique" planets I suppose--to worlds where thoughts could become real, etc, that the Federation then typically stayed away from and might even bar travel there, at least officially.)
What that means is I think you should you take some time to consider how aliens (and humans) react to such worlds (or at least A world), and what presence, if any, they already have there (and how the locals perceive and react to them, and what interest they have in alien technology and science).
And if the physics are different that allow for magic to work, then how does that affect technology? If it causes it to malfunction, then can it be adapted to account for the changes? Can the source of the magic be identified and thus replicated elsewhere? Does the magic work because of some strange and bizarre generator hidden away (and perhaps still controlled by a faction) that aliens (and humans) would want to claim for themselves? Or could it be that this star system is from another universe that somehow got pulled "mostly" into this universe so that they still operate by some or all of the rules of their previous universe? In this case, was it done deliberately (and if so, why) or was it a cosmic accident? Can this world serve as a nexus between universes (perhaps the planet/star system existing in both universes simultaneously), perhaps even allow an invasion from one universe to another?
I personally found one series fascinating in which kids from modern Chicago get abducted by Loki into a dimension of magic (it was an interesting premise, not super simple as such stories tend to be) and they managed to get far by using pop culture (the magic that brought them allowed them to speak with anyone of that world regardless of the language). They were such popular minstrels which kept them from being killed by the barbaric citizens, though at the same time made them valuable slaves (among other complications that came out of it), so it was a two-edged sword. That is, assuming they're not totally alien to each other and can communicate reasonably well, how do the cultures (which will be based on their respective understanding of how the universe work) interact...and mix?
For that matter, can the two physics be mixed to create techno-magic? Offhand, some magical stones taken from say a magical stone circle giving power to devices (even weapons). Halloween III explored that concept clumsily, but there are plenty of urban fantasy and anime that explores that possibility in such depth, some of them set in say Victorian times, or even the Old West and further back. You could have "crystal ball telecommunications" (and perhaps it's just as easy as pointing out the possibility when it's such a bizarre concept they never considered it--beware of thinking that they'll think like us, which is untrue even if they're humans, and also don't mistake primitive for stupid who would bow to someone with interesting magicks or devices as a god).
With a little nudging, there could soon be (if not already existing) glowing crystals that can be made to light streets and act as flashlights (and may have added features, like allowing one to see what's beyond a door, though even in this case something as simple as a curtain could still prevent people from looking into a room, though those anxious about protecting their privacy would surround their walls, and maybe roof, with curtains in this case), and even magical firearms (put in a magic stone and they can fire, though there may be limits to it...and keep in mind in this case that destroying the power source would become a priority of enemy forces once they understood the concept, who would also be trying to build their own power sources while destroying the enemy's). 'Course if they have any power to replicate what already exists then you have an instant industrial society (in its own bizarre way) primed to be born (if it's not already), though it could easily create faulty duplicates of say laser guns (and thus modify as listed above).
And for added tension, perhaps their existence is a threat to this or both universes, either accidentally or on purpose. (Here I'm thinking of Glory trying to get to her own universe, only in this case a group or some mad entity is experimenting to get back to his/her/its reality with this planet appearing in the scifi universe a sign of its early experiments which will only get more refined that can destroy entire universes in the process.) In this case, people can get to care about the characters only to find they're all doomed anyway (barring the plot twist, of course).
