Jordan's injury is identified by the doctor as being to her "lingual (tongue) frenulum," when it is, in fact, her "(inferior or lower) labial (lip) frenulum." The frenula are vertical pieces of mucosa that connect various parts of the mouth to each other.
At the beginning of the episode "Monster" in series two, the opening quote 'Let's kill all the lawyers' is cited from Henry IV. It is actually a quote from Henry VI Pt 2, Act 4, Sc 2.