Played staight on the Hot 100. Her only #1 was her American Idol coronation single "Inside Your Heaven". And her second-highest ranking of #6 was... a cover of The Pretenders' "I'll Stand by You", done for a 2006 Idol charity special.
Many of her big country airplay hits have only gotten to #2 or #3 on the airplay charts, due to the label focusing entirely on the Mediabase charts. As a result, "I Told You So" and "Two Black Cadillacs" only got to #2, but the far more obscure "Heartbeat" was a #1 on Billboard. Averted overall, as "Jesus, Take the Wheel" is still her longest-reigning #1 airplay hit at six weeks.
Dawson Casting: Since the girl in "Blown Away" can't seem to escape her abusive father, it implies that she's still in high school and under his care. Carrie was 29 when she made the video, and while she's gorgeous and very youthful looking, it's a stretch to believe her as a teenager.
Executive Meddling: Many fans lament the fact that Underwood's label seems to concern itself exclusively with the Mediabase charts while ignoring the Billboard charts, resulting in many of her songs hitting #1 on Mediabase but barely missing on Billboard. Granted, she's far from the only artist that this has happened to, but she seems to be impacted by it the most frequently by far.
Keep Circulating the Tapes: In 2007, the aforementioned "I'll Stand by You" cover was done for an American Idol charity show. The cover was briefly made available on iTunes, causing it to reach #6 on the Hot 100 and gather unsolicited radio airplay. It was withdrawn not long after the show ended, and has not legally been available since.