When Lex's men reach the truck and come to a halt there are brake marks in the mud exactly where they are stopping, showing that they've shot this scene more than once.
When Lucy plays the violin at Lex's mansion, she never moves her left hand to play any notes or add vibrato. She's obviously miming.
As Clark is chasing after the semi-truck with Lois and Lucy in the trailer you can see the Rocky Mountains in the background. Kansas doesn't have mountains. However, Vancouver, where the show is actually shot is home to part of the Canadian Rockies.
The road sign visible from the overpass on which Clark situates himself to find the semi holding Lois and Lucy indicates an exit for U.S. Hwy. 54 to "Cherry Hill." U.S. Hwy 54 does indeed run through Kansas, though there is no township of "Cherry Hill."
Upon arriving at the Kent farm, Lucy is eager to "wash off four time zones' worth of airport connections." Switzerland to Kansas is more than four time zones.