CSI - Incorrect Lane Pair
At the beginning of the episode, they show a pro bowling match. The problem is the pair used has the even numbered lane on the left side, meaning 2 ball-returns are used, one to the left and one to the right. Professional as well as amateur
matches have the ball return in the center, since bowlers switch lanes between frames. This way bowlers don't have to physically move their ball from one rack to the other
CSI episode "Lovers Lanes"