Ben is wearing a Timex Indiglo watch. Timex received the patent for the Indiglo® nightlight in 1988, but according to the Timex website, "The company introduced the industry's first electroluminescent watch face in 1992". This means that the purge would have had to have occurred during, or after, 1992. However, one must take into account that the Others kidnap Alex in 1988, and not only was she not shown but Rousseau apparently doesn't recall ever meeting DHARMA. Furthermore, in the Lost Experience, Hugh McIntyre stated that the DHARMA Initiative funding was cut in 1987. Thus, the watch clue might be a production error.