- Katherine McNamara as Clary Fairchild
- Dominic Sherwood as Jace Herondale
- Alberto Rosende as Simon Lewis
- Matthew Daddario as Alec Lightwood
- Emeraude Toubia as Isabelle Lightwood
- Alisha Wainwright as Maia Roberts
- Isaiah Mustafa as Luke Garroway
- Harry Shum Jr. as Magnus Bane
- This episode will feature a "Sizzy" scene which will be accompanied by a song.
- Some scenes for this episode were shot in Paris. Filming for these scenes took place in May 2018, after filming of 3B (specifically City of Glass).
- Show writer Bryan Q. Miller used the words "the shop" to tease the episode, suggesting that a shop may play an important role in this episode. This may be referring to Kosti Lustr which is set to be featured in 3B.
- ↑ ‘Shadowhunters’ To End After 3 Seasons, Freeform Orders 2-Hour Finale To Wrap Series In 2019 | Deadline
- ↑ 2.0 2.1 https://twitter.com/toddzer1/status/1059623391441743872
- ↑ https://twitter.com/mattdirector/status/970772609628549121
- ↑ https://twitter.com/mattdirector/status/968840948200304642
- ↑ https://twitter.com/mattdirector/status/978435870880681985
- ↑ http://web.isan.org/template/1.2/publicSearch.do?code=0000-0004-1432-002D&nav=1
- ↑ 7.0 7.1   — Photos of filming taken by a fan | VK
- ↑ "There is a sizzy scene in 312 that..." Todd Slavkin on Twitter
- ↑ "What episode is the scenes that were shot in Paris?" "312!" Todd Slavkin response on Twitter
- ↑ "Missing our cast as they are shooting in romantic Paris this week." Kathleen Jenkins on Twitter
- ↑ Katherine McNamara's Favorite Relationship on 'Shadowhunters' Isn't The One You Think It Is | Just Jared Jr.
- ↑ "312 the shop" Bryan Q. Miller on Twitter
- ↑ https://twitter.com/toddzer1/status/1003356849687498752