Below are some other performances from the later episodes on that GLEE season, in no particular order:

Adam auditioned in August 2008 for a role in the (then upcoming) FOX TV show GLEE, but was rejected because he was too old to be on the show according to the casting director.

On November 7, 2013, about 1910 days later (it is hard to find the precise date of the audition), Adam was introduced in the recurring role of Elliott "Starchild" Gilbert during the "A Katy or a Gaga" Episode 4 of Season 5.

His show-stopping performance of Lady Gaga's "Marry The Night" got rave reviews even from critics who did not like the rest of the episode.

From An Audition Rejection To A Guest Star Spot