In a tape recorded interview with a murder suspect, Sam gives the date as Wednesday, 16 March. However, March 16th in 1973 was a Friday, and March 16th in 2006 was a Thursday. The only year in the 70s in which March 16th fell on a Wednesday was 1977, while March 16th 2005 was a Wednesday. (Whether this was a production error based on the 2005 calendar or a deliberate error by the producers in keeping with the ambiguous nature of events is unknown.)