Many of the episode titles are also the names of songs; "The Beast in Me" is by Nick Lowe.
Sasha Alexander and John Doman have worked together before, notably in NCIS Season 2, Ep. 12, Doppelgänger.
The characters mention Whitey Bolger had been missing for years. He was arrested in California on June 22, 2011 after 16 years on the run for murder, about a year after this episode was filmed, and died in prison in 2018.
Jane calls Maura's tortoise Toro. His name is Bass. They weren't talking about the tortoise. They were talking about sushi.