I've been building the new app-controlled Batmobile. As far as I can tell, step 34 shows many more elements in the parts list than are actually used in the build. What is going on here?
They are in a perforated bag and the entire contents of the bag is listed. You only need some of them in this step and in a few steps later on. I think such bag is called an "accessory" bag and it is common to have the instructions like this for such bag. The first set that comes to mind that did the same was the Big Ben 10253 where on step 269 on page 187 the entire contents of the bag with minifig tools is listed while you only need 4 times 2 pieces to build the clock arrows.