Goofs

The rain pattern on the airplane window changes direction and disappears in different scenes.

An emergency window is designed to press tightly against the aircraft fuselage when pressurized at 20,000 feet. It is impossible for one to pop out of a pressurized aircraft at cruising altitude. An emergency window can only be removed inward, into the cabin, when the aircraft is depressurized at ground level. Wilson could not have removed the window at 20,000 feet as depicted.

Even if Bob Wilson had been able to open the emergency door in flight, the cabin would have depressurized quickly, causing anything that wasn't tied down to fly around the cabin. But there is nothing blowing around the cabin as he hangs out through the open emergency door.

The plane from the outside appears to be a twin-engine Convair 240/340/440, but from the inside it is a four-engine DC-6 or DC-7.

Even in 1963 the airlines would not let someone afraid to fly sit at the emergency exit.

Even if Wilson had been able to aim the revolver directly at the gremlin as depicted, the relative wind blasting past an aircraft flying 300 to 400 knots would have diverted the paths of the bullets rearward, well behind the body of the gremlin.

Rain can be seen trickling straight down Bob's window, indicating that the "plane" is not moving. In flight the rain would be blown straight back. At the speed these old planes flew, you would only see tiny trickles of water, even in very heavy rainstorms.

In one of the earlier shots, the furry creature is wearing a jacket and turtleneck.

While the creature is tearing into the engine closest to the window, the lightning effect shows the leather soles of stuntman Nick Cravat's shoes.

When the ghoul kneels to tear the wing apart, his leather soles show, revealing that this is someone wearing a toilet lid cover-like fleece suit.

From the outside of the airplane, during a lightning flash, the cables that pull off the emergency escape door are visible.

Around the mid point of the episode, in a low angle two shot of Wilson and his wife, in the right bottom corner and later, middle of the frame.