Corrected entry: In the beginning, Nolan Walsh drives past a sign facing the camera, which says 'Welcome to Kentucky', meaning he is plainly driving OUT of Kentucky. However, the Walsh Farm and the Turfway Stadium are meant to be IN Kentucky.
In the scene where Stripes is looking in the water at his reflection, his body and the reflection don't quite match up. You can tell by his movements that his reflection is computer generated. (This is verified by the audio commentary.)