When Arthur is told the Pudding Company pen has leaked ink on him, he is holding it up at face height with both hands. It then cuts to a different angle, and he is only holding it in his right hand, and much lower.
As Denise goes down the aisle, a red stain suddenly appears on the carpeting.
During the road trip, Spence tells Doug to take I70 to I64 and then I40.
You can not travel that route without taking odd-numbered interstates.
Even numbered interstates run East and West.
Odd-numbered interstates run North and South.
In actuality, they would have needed to take I70 to I77 to I64 to I75 to I40 to reach their destination.
While driving from New York to Memphis, high desert terrain is seen going by outside as the four guys drive in the minivan. The terrain between New York and Memphis consists of very green mountainous areas, rolling hills, and flat fertile farmland. There are no desert areas along that route.