Here's a few of mine:
1. More all-male teams are eliminated first rather than all-female teams. (I never knew that)
2. There have only been a total of 11(or 13) all-female teams who made it to the Final 5 of The Amazing Race. (Dustin and Kandice and Kisha and Jen did it TWICE)
3. Not counting the Family Edition, only 7 Parent-Child & Grandfather-Grandson teams made the Final 5.
4. Out of the 19 seasons, 10 all-female teams have been eliminated at 9th place, another 8 have been eliminated at 10th place.