Character mistake: Xander is nicknamed "Triple X" by Augustus Gibbon because he is, in his words, facing a triple strike; "Grand theft auto, reckless endangerment and that little bridge stunt of yours." While there is judicial precedent of two felonies committed in the same act counting as separate strikes when the same person ended up in court for a third one, the three strikes law is designed to fight recidivism, and Xander, apparently a first time offender, wouldn't instantly be put away for life because he committed multiple crimes at the same time. Incidentally, reckless endangerment is not a crime per se in California (but 'reckless driving' is); Gibbons however is not a lawyer of the State (character mistake) and possibly could just be bluffing trying to intimidate Xander. (00:30:30)
Character mistake: In the theater, Gibbons tells Xander that the scientists Anarchy99 have on their payroll are "specialized in biological weapons." But Silent Night, as it turns out, is not a virus or toxin, but it's chemical based, so their old Soviet creation they are specialized in is not a 'biological weapon' at all. (01:08:15)
Character mistake: When Xander tells Yelena "There must be something we can use", she goes through the manual and reads aloud "Harpoon, gun, parachutes built into seats, ejectable roof." Minutes later, Xander says that they must have missed something, and she says "Weapons, there are more weapons here in the back", and there's the harpoon gun she already read about earlier, she was even on that page of the manual. (01:43:50)
Character mistake: When Asia Argento reveals that she is a Russian agent, she says that she works for the FSB, the Russian CIA. This is wrong, however, the Russian equivalent to the CIA is the SVR, the FSB is more like the FBI.
Answer: Xander and Shaver were back at the compound where they first met. The one where Xander finds out that Shaver is responsible for making the gun and darts that were used to knock him out. In that scene Shaver shows Xander some of the cool stuff that he had made, and Xander uses a few items later in the movie.
Rollin Garcia Jr