When Benson and Rollins are talking to Natalie's parents her mom says after she broke her ankle playing soccer her doctor prescribed her OxyContin for her post-operative pain. However OxyContin would not be prescribed for post-operative pain, OxyContin is a long acting, extended release formulation of oxycodone and is only used for people that have long term chronic pain that needs around the clock relief, it would never be prescribed for short term post operative pain relief. Immediate release oxycodone, and other short acting opiates, are used for post operative pain.
When they show Billy Lucas' rap sheet his gender is listed as female. The narcotics detective also says that he has been in Riker's "since January of last year" (which would be January 2016 as the episode takes place in 2017), yet his arrest record states he was arrested in February of 2017.
When Rosemary overdoses Dr. Barkley, she says "it's fentanyl, all the Narcan in the world won't save him". While it is true that fentanyl is a very potent opioid (100 times more potent than morphine and 25 times more potent than heroin) a fentanyl overdose can be reversed with naloxone (Narcan), it just takes a larger dose of naloxone to reverse a fentanyl overdose than it would for a weaker opioid like morphine, heroin or oxycodone. Also the naloxone injection would need to be administered quickly as fentanyl has a much faster onset of action than most other opioids.