New this month Continuity mistake: When Dr Cox throws JD's TV remote on the table, it lands upside down near to the magazine on the middle of the table. However, the next shot of the table shows the TV remote facing the right way up and near the corner of the table. Also the magazine seems to have moved slightly away from JD's beer.
New this month Continuity mistake: Just after Dr Elliot Reid says "frick on a stick with a brick", Dr Cox and Dr Reid have a conversation. In between shots Dr Cox's stethoscope seems to change position. Look mainly at the ear piece side and you'll notice it's closer to his neck and sometimes further. Dr Reid's starts off with 1 earpiece behind her name tag and then between shots both earpieces are above her name tag. At the very end of the conversation, they somehow move behind her name tag.
Character mistake: Early in the episode, Keith pages JD from home to the hospital. When JD arrives, he asks Keith what's the big emergency and Keith asks if he wants the patient to be prescribed unfractionated or low molecular weight heparin. JD gets angry and says that they're the exact same thing. This is in fact completely incorrect. Low molecular weight heparin is made from fragments of unfractionated heparin. They have different effects in their metabolism, half life and dose monitoring (unfractionated needs a blood test, low molecular weight doesn't). The choice between unfractionated and LMWH is an important clinical decision and should not be dismissed as "the exact same thing".