Although the show was broadcast in color for the Eurovision and Intervision Networks and through satellite to Chile, Puerto Rico and Brazil, the technical limitations of TVE at that time forced the transmission to be done in black and white inside Spanish territory, and also forced the recording of the TVE tape in the same format.
TVE had to borrow the color cameras from the BBC because all the TV cameras they had (until 1972) were black and white.
The interval sequence "La España differente" (The Different Spain) was accompanied by specially composed music by Luis de Pablo.
Salomé's dress was designed by renowned Spanish fashion designer Pertegaz. It was made of thousands of small canutes made of light blue porcelain, and it weighed 14 kilograms (around 31 pounds). As Salomé said, in the rehearsals, she had been wearing just the lining of the dress, without any porcelain. When the night of the festival she tried to wear the full dress for the first time, she couldn't lift it on her own and needed assistance to put it on. As if the weight wasn't enough, costumers made her wear three collars that weighed 1 kilogram (2,2 pounds) each.
This was the first time in the history of the contest that any country had won back to back contests. Spain had won in 1968 and did so again in 1969 (albeit in a four way tie). Luxembourg also accomplished this in the 1972 & 1973 contests and so did Isreal in 1978 and 1979. However, Ireland was able to complete a trilogy of wins in 1992, 1993 and 1994. No country has been able to accomplish back to back wins since.