Kevin informs Kate that Bobby left Barbara's apartment at 1:15 a.m., however it is already on the time line on the incident white board.
Lanie says, "Secondary tox panel detected traces of tyramine, which is harmless...". Actually, in cases of dangerous MAO inhibitor/food interaction, it is the elevated tyramine levels that cause catastrophically high blood pressure.
When listening to the tapes, the headphones are still plugged in even through sound is coming through the speakers.
Ellie Monroe claims to be a huge fan of Castle, having read Nikki Heat 3 times. Yet she states 'I didn't know you worked with law enforcement' while on the Bobby Mann show.
Castle hears the door buzz and thinks it's Alexis back from her trip, but there's no reason for Alexis to push the door buzzer. She should have a key since she lives there.