I remember watching this! It was pretty, a lot more in depth than the usual stories about royals that are shown in America. It actually aired on May 14, 2004 (20/20 has aired on Fridays at 10/9 central pm on ABC since 1987) the day of Frederick and Mary's wedding. You can see at the of the F&M segment footage from their wedding earlier that day (time difference and all) and the reporter saying "And today..." In this or another segment, the reporter mentions that the Crown Prince of Spain will marry a divorcee "next week" (May 22 and they show Felipe and Letizia at F&M's wedding).
Real princesses always wear sleeves so why do we all go for strapless?