When Sam is fighting with the bad guys on the roof of the boxcar, he slides off the roof and hangs off the side. The bad guy stomps at his hands and McCloud grabs his leg to pull at it. The bad guy clearly starts to fall backwards and toward the center of the boxcar. Then the scene switches to the side of the boxcar and the bad guy is now no longer falling backward but forward and off of the roof.
When Jessica joins McCloud and Shannon at the roof top restaurant, the boom can be seen at 11:30.
The racetrack scene features palm trees, something common in southern California, not New York, where most of the show takes place.