When Catherine asks to see the bottom of the suspect's shoes, she is holding a picture of a shoe print with the writing at the top of the page and the wear pattern near the top. When the suspect puts his feet on the table, she turns the paper the other way up but the print is still the same way up.
Flipped shot: when Grissom is first driving to Jackpot his car is in the left lane and the 'Curve Ahead' sign is on the left hand side of the road.