The cast had just two days to rehearse, except for Darren Criss. Despite playing the lead role, Criss had no rehearsal time due to his commitments on Glee.
Devin Lytle (Cho Chang) is friends in real life with Evanna Lynch (Luna Lovegood) and was able to get her to reprise her role as Luna for this production.
Daren Criss's mic had a technical malfunction before the show began, so all of his audio had to be picked up by ambient microphones and through the mics of his costars. Because of this, Criss sounds notably more faint and echo-y than the rest of the cast.
The actress that portrays Luna Lovegood in this play is actually the actress who portrays her in the Harry Potter movie saga, Evanna Lynch.
Darren Criss was told that the cast would only be performing a reading of the script onstage, not that they would be staging it with costumes, blocking, and props. It wasn't until Criss showed up for the performance and was put into costume that he realized they were doing a real performance of the show.