This episode is the farthest back in time (1692) that any Timeless episode has taken place.
The man that is shown in chains accused of being a witch was Samuel Wardwell. He was hanged along with the other woman that day. He also just happens to be the ancestor of actor Scott Foley and is discussed on his episode of the genealogy show Scott Foley (2016). Another point of fact, Shawn Ryan, the executive producer of the show, also ran The Unit (2006), in which Scott Foley was the lead actor.
When Goran Visnjic says he knows witches in this episode, it could be a nod to his role in Practical Magic.
Henry Lubatti, who plays judge Hathorne also appeared in the series Salem, which is also about the Salem witch trials.
Patrick Fischler and Abigail Spencer both appeared in the tv series Suits. Fischler played Elliot Stemple and Spencer played Dana Scott.