Thawne's fate is a nod to the events of "Legacy."
As of this episode, The Flash has surpassed Arrow (2012) as having the most episodes of any series in the Arrowverse.
This is the final episode of The Flash to be presented in matted widescreen format. The series would transition to letterbox format starting with the next episode.
Nora, Alexa, Bashir and Deon turn into pure Force energy to power up Barry The colors look similar to the teleport energy from Power Rangers.