When Col. Brand approaches Macy Taylor from behind to attack him with a sword, Macy glances at a small oval shaped mirror. Macy sees the approach in a close-up of the mirror, which has a trapezoidal shape that is wide at the top and narrow at the bottom, no longer an oval.
After dispatching the old man, Superman runs and leaps to fly to rescue Perry and Jimmy. You can briefly see the springboard rebound into the frame as he takes off.
When Superman takes off in one scene, the springboard is visible at the bottom. (This was probably considered acceptable. In the age of CRT displays, there was so much overscan that the board wouldn't have been visible to the home viewer.)
Though Metropolis is presumably on the East Coast (various episodes give Washington, Baltimore, and Pennsylvania as reasonably close destinations), the Bayou Hotel appears to be in Louisiana.
When the Colonel drives Perry White's car over a cliff, the backdrop looks like something straight out of a John Ford western (eg, Mounument Valley).
The Bayou Hotel and southern trappings of the local characters suggest that the story takes place in Louisiana. The highest point in that rather flat state is heavily wooded Driskill Mountain, 535 feet above sea level. When Col. Brand sets Perry White's car to drive off, the photo-like background shows tall, steep, bare-rock mountains reminiscent of Sedona, Arizona. The lowland lake areas in Louisiana have no roads that can end suddenly for the car to plunge hundreds of feet.
The clerk says they wouldn't be comfortable staying there for various reasons one of them being they have no electricity yet the lamp on the desk is lit up and when Perry is in his car making a phone call all of the hotel windows are lit up way brighter than they would be for kerosene lamps.