Short answers, pulled from the story.
An estimated 650 million viewers worldwide watched the first steps on the Moon in July 1969. In the United States alone, more than 53.5 million households tuned in, making it the most watched television programming up to that date.
The Giant Leap tour was a 38-day, 23-country journey undertaken by Neil Armstrong, Buzz Aldrin, and Michael Collins after returning from the Moon. Starting in Mexico City, the tour passed through South America, multiple European countries including England and Vatican City, and Africa.
Hungary declined the United States's invitation because relations between the two countries were strained. Hungarian crown jewels had been held in American custody since the Second World War and were not returned until 1978.
The Mr. Gorsky story is an urban legend claiming that Neil Armstrong said "Good luck, Mr. Gorsky" from the lunar surface, referencing a childhood neighbor whose wife had made a ribald remark involving the Moon. Armstrong said in 1995 that he first heard the joke from comedian Buddy Hackett in California.
Australia's ground stations supplied the highest-quality footage of the moonwalk. Honeysuckle Creek carried the signal for the first eight minutes of Neil Armstrong's walk, until the Parkes dish gained a clear view of the Moon and took over for the remainder.
Paul Calle designed the original 10-cent Apollo 11 stamp issued on the 9th of September 1969. His son created the 20th anniversary stamp in 1989, and both father and son collaborated on the 1994 anniversary stamp.