Here is video of Michelle Obama's pitch to the International Olympic Committee in Copenhagen, where she said at around the 1:10 mark of the video, that some of her best memories are of "sitting on her Dad's lap," watching the Olympics, and "rooting for Olga, Nadia, Carl Lewis and others for their brilliance and perfection."
Uh, Carl Lewis was born in 1961, and Michelle Obama was born in 1964. Lewis first participated in the Olympics in 1984 - when Michelle was 20 years old! In her rush to be overly dramatic, she forgot to check some of the facts.
If you listen to her whole pitch, it is extremely syrupy and all focused on "me, my, and I." This had to be a turnoff to the Olympic Committee.
Hat Tip: All the Best at Free Republic caught this and mentioned it in a comment there. Nice catch!