This was most likely just an error on the writer's part.

When Rossi compares The Tylenol Killer to the episode's unsub, he mentions that the murders occurred in 1986, while the Tylenol poisonings actually happened in 1982.

Aaron Hotchner: 'Cruel is the strife of brothers.' - Aristotle.

Aaron Hotchner: 'Rarely do members of the same family grow up under the same roof.' - Richard Bach.

The series stars Hong Kong actors Danny Chan and Alex Fong as the 'Twin Dragons', Kou Zhong and Xu Zhiling respectively.

'And She Answered: 'When You Return to Me, I Will Open Quick the Cage Door, I Will Let the Red Bird Flee'.' by AM 4 Twin of Brothers is a 2011 Chinese wuxia television series directed by prolific Hong Kong film director Wong Jing adapted from Huang Yi's novel of the same Chinese title. During the renovation, Jonathan struggles with the budget as costly problems with the pool and chimney add up.

'My Songs Know What You Did In the Dark (Light Em Up)' by Fall Out Boy.

Jayne Atkinson - FBI Section Chief Director Erin Strauss.

Meanwhile, the Replicator begins to zero in on the BAU. The BAU is called in to investigate a string of deaths in Manhattan tied to apparent ecstasy overdoses, and Hotch discovers that his estranged brother Sean is caught in the middle.

Twin of brothers episode 1