“From the start, “Archive 81” is put together with a high degree of craft, skill and imagination. There are basically two worlds here: Dan’s present-day world in the snowy, isolated Catskills; and the world on the tapes, 25 years earlier, in which a young woman, Melody (Dina Shihabi), interviews the residents of the building destroyed by that fire. The filmmakers, particularly the five editors, make the connections between these two worlds eerily, increasingly permeable”