Directed by: John Carpenter
Starring: Keith David, Meg Foster, George 'Buck' Flower, Roddy Piper
Visible crew/equipment: When Nada is escaping with Holly, you can see the reflection of the film crew on the car. (00:44:15)
Visible crew/equipment: After Nada opens the box and looks at the shades, if you look carefully, you can see the filming equipment reflected in the lenses.
Revealing mistake: During the big fight scene, you can tell easily that Frank is wearing knee pads (try looking when his pant leg is wet). Construction workers will often wear knee pads for work but most often they wear them on the outside of the pants to save the knees of their pants. (00:58:50)
Trivia: The big fight scene is spoofed in "South Park" when the crippled kids Timmy and Jimmy fight, instead of the film's Nada and Frank. The episode is called "Cripple Fight".
Answer: Yes, she was collaborating with the aliens in exchange for wealth and a comfortable lifestyle all along. She was playing dumb, even when she showed up at the underground meeting, a double agent.