At the end when Erica is presented with the Nationals trophy,
her sunglasses are on top of her head but as it zooms out and she raises the trophy, she's wearing the sunglasses. They then are back on top of her head when the cameras zoom in again.
In the movie there are snow-capped mountains in the background at the track near Houston, Texas. In actuality, there are no snow-capped mountains, or any mountains, within hundreds of miles of Houston, which lies on a sub-tropical coastal plain.
In the close up of the license plate Erica's truck after she picks up Randy, the expiration year is set to 99 (1999). Since the movie was made in 2003, it would have to have an expiration of 2003 or 2005, since tags are good for 2 years.