I would disagree with you that these are not good examples. The reason is that all three of these examples were published in university textbooks. Piltdown Man was not taken out until 1953, but because textbooks were reused back then, this was taught as fact by my university professor in 1980, as was Haeckel’s embryos. These fraudulent drawings were still in university textbooks in well into the 1990’s.
The 99% DNA difference was in the university textbooks a few years ago, and likely still is. But according to Minute Earth in their episode, “Are we really 99% chimp?”, it is based on wishful thinking, not fact.
“When researchers sat down to compare the human and chimp genomes, the single letter differences were easy to tally, but the big, mismatched sections weren’t. For example, if a genetic paragraph, thousands of letters long appears twice in a human scroll, but only once in a chimp counterpart, should that second copy be counted as a single change, or just one.”
“And what about identical paragraphs that appear in both genomes, but in different places, or in reverse order, or broken up into pieces. Rather than monkey around with this difficult questions, the researchers simply excluded all the mismatched sections, a whopping 1.3 billion letters in all, and performed a letter by letter comparison on the remaining 2.4 billion, which turned out to be 99.87% identical.”
When I first heard this, I assumed the information was not true. But as of yet, I can find no one that has rebutted it, and the episode is still up. So it seems the 99% number was not misleading, but actually fits the definition of propaganda.