(at around 15 mins) When Danno pulls alongside the woman from the gas station, he is on a 2-lane road with barely any shoulder. A few seconds later, a car drives past Danno on the opposite side of the road, but a front shot shows the same 2-lane road, with no room for a car to go past.
When Danny exits the gas station after meeting the NY girl, his Camaro has 4 end pipes, whereas in other episodes it has 2 end pipes.
While interrogating one suspect in the hospital, Grover starts to cut the rope holding up the suspect's immobilized leg. As the shots change between a view of the suspect, McGarrett, and Grover, the rope goes from frayed, to whole, and then back to frayed again.