When Abby is on her computer pulling up the 9-1-1 call from Annie Marks husband, she goes from not having her nails painted, to them being painted black, back to them not being painted at all.
Hen tell Buck that she made the mistake of asking Bobby about his book '3 months on the job', implying that Bobby was her chief 3 months after she began working as a firefighter.
However, it will later be established that Hen began working at the 118 at least around 2 years before Bobby became Captain there.
When Athena hears about trouble on a plane she goes charging off even though the radio call never mentions what airline or gate.