- Milestone Celebration: This is the 100th episode of Arrow, and celebrates that by bringing back several characters and making many continuity nods.
- Real-Life Relative: The waiter that serves "Laurel" and Sara a drink before they meet Ray is played by Caity Lotz's Real Life father.
- What Could Have Been: Roy was going to have a larger role in the virtual world as Thea's boyfriend, but Colton Haynes was unavailable.
- Written-In Absence: Slade in this episode is notably portrayed by a Stunt Double as oppose to Manu Bennett, most likely due to said actor's negative reaction to the series post season 2.
Trivia / Arrow S5E8 "Invasion!"