So, I just so a movie with John Gallagher Jr. in it.

Some other movies / TV shows with Spring Awakening cast members in it:

Blake Bashoff was on Lost (He wasn't an original off-broadway cast member, but he was on Broadway and the tour.)

Lea Michele (the ORIGINAL Wendla, both off-broadway and Broadway) stars in Glee. (Also Jenna Ushkawitz, as Tina, who was a swing on Broadway.)

(Here she is as Rachel Berry)
)...