Through the Looking Glass (Lost) series would conclude 48 episodes after "Through the Looking Glass", they felt comfortable playing flashforwards as early as the third-season finale. Post-production wrapped on May 21, 2007, only two days before it aired on television. The score was composed by series musician Michael Giacchino, while popular music was also featured throughout the episode. Charlie also sings a song in the episode that was written by Dominic Monaghan, who plays him. A "Lost" season finale is approximately twice as long the average "Lost" episode. Due to the episode's length, it was split into two parts in some countries and when released
Lost (TV series) many items found in the "Lost" universe, such as Apollo candy bars, Oceanic Airlines, Ajira Airways, the TV series "Exposé" and MacCutcheon Whisky can be seen in "Once Upon a Time". In addition to traditional terrestrial and satellite broadcasting, "Lost" is available from various online services, including Amazon Video and Hulu. It was one of the first series issued through Apple's iTunes Store beginning in October 2005. On August 29, 2007, "Lost" became one of the first TV programs available for download in the UK iTunes Store. In April 2006, Disney announced that "Lost" would be available for free online