Yes, that is nit picking.
Of course a Sat V could never have been launched in secret. But just as unlikely to me is the idea of a bar filled with freakish looking aliens from all over the universe drinking, talking, playing music together. But I liked Star Wars anyway.
The difference is Star Wars doesn't take place in our world. Apollo 18 supposedly does.
The thing with any fantasy is there's no reality to base it on, and despite some claims to the contrary, SW is fantasy, not SF. There's no scientific basis for the Force, lightsabers, laser "bolts", any of it. Star Trek is the one that made the effort to be possible (if not actually real), SW never bothered because it's a fantasy.
So if I see a film with elves, dwarves, and hobbits and it has a dragon in it, I'm fine with that. If I see a film about the US space program and then there's a dragon attacking the Cape prior to a launch, I'm NOT fine with that. It's the context, not absolutes. If you stick with absolutes, well, pretty much no film is worthwhile because even those based on real events, like Apollo 13, have a lot of fictionalized events and dialogue as filler.
The Jedi Master