Goof: Bobolit mentions his previous abuse of/addiction to inhaled anesthetics, specifying nitrous oxide. Nitrous oxide is actually a dissociative analgesic, which is not potent enough to provide general anesthesia for surgery patients. The effects wear off almost immediately upon cessation of inhalation. Bobolit was certainly under something stronger when he attempted to swap faces with Christian in Season 2.
Additionally, addiction to nitrous isn't technically possible.