Scott lands his plane (a Cessna 152) and gets out of the right hand side. The pilot sits on the left.
When Frost and Toolan drive into the police station toward the end of the episode, the registration plate at the front of the Volvo estate is different to the rear (the front reads "A388 JCK" and the rear "A467 NRN").
After a severed human arm is discovered on the banks of the river Humber, Frost meets with police in Hull who are investigating the discovery, yet the arm is washed up on the west bank which would fall under the jurisdiction of the Grimsby force. Also; on his way to Hull, Frost is seen driving westerly across the Humber Bridge - again this would take him away from Hull.