: Jenny is interviewed by writer Stacey Merkin, which becomes a pivotal "piece" of drama for the rest of the season. "The L Word" Livin' La Vida Loca (TV Episode 2007) - IMDb
In the context of season 4, episode 2, titled " Livin' La Vida Loca ," the "useful piece" refers to a specific scene or plot device involving the introduction of Papi (played by Janina Gavankar). [S4E2] Livin' La Vida Loca
: Alice meets Papi and discovers she is a legendary "useful piece" of information for her map of lesbian connections. Papi "lights up" on The Chart even more than Shane, boasting over 1,000 conquests . : Jenny is interviewed by writer Stacey Merkin,
While the query is slightly ambiguous, it most likely refers to one of these key "pieces" from the episode: Papi "lights up" on The Chart even more