In the episode's opening scene, the bus pulls into "Flagstaff" and parks on the (left-hand) curb directly in front of the hotel. However, when the passengers alight, the bus appears to be on the opposite side of the street.
When they enter the professor's office, Perry sees the body first and warns Dyker not to touch anything. At the same time, Perry puts his own bare hand on the corner of the desk as he crouches to examine the body.