When Evan opens the crate on the truck, he says "it's just an MRI." It's actually a part of a fluoroscopy machine, not an MRI.
While aspirin (or, rather, an aspirin-like compound) does naturally derive from willow bark, ibuprofen does not. On the other hand, re-enactors often use period language for anachronistic items that can be simply concealed (or cannot be done without, such as medications).