If this was really May 11, 1977 (according to the description) then almost nobody knew what Star Wars looked like until two weeks later! But Meco's Star Wars disco wasn't even released until mid-June. I figure it's more likely that this was actually November 5th, 1977.
Of course, Star Wars wasn't released in the Netherlands until December 15th, 1977. So, other than news coverage, or foreign travels, viewers of this program still would not have known what Star Wars looked like.