Actually I guess he did get the right answer and the post-it note was invented before the others. I was talking with one of my co-workers and he was telling me all this stuff about it that's the only reason I'm looking into it.
"With regard to the controversy, Jeff Apploff, the executive producer of "Million Dollar Money Drop," is standing firm, issuing this statement to Gawker today: "The integrity of the questions and answers on our show are our No. 1 priority. In this case, our research team spoke directly with 3M, and they confirmed that although they had given out free samples in test markets in 1977 and 1978, it wasn't until 1980 that Post-Its were sold in stores. Million Dollar Money Drop stands behind the answer that was revealed on the show."
invention dates:
post-it notes: 1977
Sony Walkman: 1980
Mac Computer : 1984
Source:
http://www.ktar.com/?nid=50&sid=1368458