So there's always weird situations coming up in Star Wars that would be easily solved by modern technology. Or even tech from several decades ago. Like radar. Star Wars doesn't seem to have radar. I'm not sure they have thermal imaging either. Now I haven't explored the EU, so I'm basing this purely off what we see in the movies and shows. I was thinking it would be handy for GMs though to have a list of all the stuff Star Wars seems to not have that we take for granted.
So here's a start:
Radar: meaning ships are basically blind in fog, clouds, or any bad weather, and ship guns all need to be aimed by a person.
Thermal imaging: You can just detect a space ship's ambient heat against the coldness of space. Also, no knowing if a building is occupied based on how hot the walls and windows are.
Paper: It does exist, but is very rare. Your not just going to find notes laying around, and very few people will have a pen or pencil on them.