Nicholas Long felt ill before his final ride. Alise Post got unclipped down the last straight in her race.
The American riders each still managed to secure third-place finishes at the recent world championships, good enough to clinch spots on the U.S. Olympic team.
After getting left off the podium at worlds in 2015, the United States has a little momentum with the Summer Games in Rio coming up.
"Pretty happy, to be honest," said Jaime Staff, USA Cycling's BMX director. "Got two in the final. Just to get two in the final ... and the podium, makes my job easier.