Episodes from the second and third seasons were originally shown exclusively on the website BroadwayWorld.com, which also partially funded the project, but were both eventually released on YouTube.

Wetherhead's husband, who was the show's lighting designer, suggested they create a web series together.

[5] All of the audition material shown is from fake plays and musicals, with dialogue and lyrics written by Wetherhead.

Submissions Only has included cameos by Broadway veterans such as Chita Rivera, Kristin Chenoweth, Audra McDonald, Hunter Foster, Adam Pascal, Jeremy Jordan, Danny Burstein and Brian D'Arcy James, Kelli O'Hara, Heidi Blickenstaff, Lin-Manuel Miranda, actors such as Rachel Dratch, Kristen Johnston, Michael Urie, Bobby Cannavale and Judith Light, and New York Post theater critic Michael Riedel.

[2] The last episode of season two notably had a large number of cameos, including appearances by Jesse Tyler Ferguson, Nick Jonas, Harvey Fierstein, Jack Falahee, and many ensemble members from the Broadway cast of Newsies.