The playwright Anton Chekhov once offered a pithy literary principle for anyone pulling together a plot. Said Anton, If a gun appears on the wall in the First Act, then it should go off the in Third.
In good drama, in other words, nothing should be unintentional. If you're not to have an audience that feels cheated when they leave the show, then questions asked of the audience in the First Act should be resolved by the Curtain.
Based on this principle, novelist Ed Cline compares my own favourite TV series The Prisoner with the series Lost, which on the face of it has many parallels. However ...
[See Ed Cline's 'Lost' and Clueless for the full story. Note that Ed "would caution the reader... about plot spoilers to follow, but there is no plot to spoil." ]