Kris Holden-Ried plays a werewolf in this series but also played a werewolf in Underworld Awakenings.
Regarding the episode title. The 1963 movie "It's a Mad, Mad, Mad, Mad World" was a comedic madcap cross-country chase film, evidently written by corporate suits, starring over a dozen performers who had been famous in the 1940s and '50s. The plot didn't matter since the film existed only to let each star do their schtick one more time.
Kris Holden-Ried who plays Dyson, also played a character named Colin Nottingham in the Christmas movie Santa Baby 2. In the movie, he asks the main character where her boyfriend Luke is, however his character gets her boyfriend's name wrong and instead asks about "Bo".
Ksenia Solo (Kenzi) and Kris Holden-Ried (Dyson) have both worked with actress Maria Doyle Kennedy. Ksenia worked with her in the TV show 'Orphan Black', playing Shay Davydov and Siobhan Sadler respectively; Kris worked with her in the TV show 'The Tudors', playing William Compton and Queen Catherine of Aragon respectively.
Anna Silk was 36 as of the pilot. Kris Holden-Reid was either 36 or 37 depending on when it was filmed.