Deliberate mistake: For reasons unknown and unexplainable, the otherwise spacious and well-equipped Moonbase has halls and doorways too short for the average human to fit through without ducking. (00:20:00)
The Cat with Ten Lives - S1-E3
Deliberate mistake: When MoonBase Interceptor pilots put their helmets on before launch, the mics are on the left side of their helmets, but when they're space borne to intercept UFOs at least one pilot closeup is a flipped shot. Then, after Lake says, "They're wide open now, where are they," the interior closeup of a cockpit is also flipped; note "GYRO" is reversed. (00:02:25 - 00:04:55)
Identified - S1-E1
Deliberate mistake: While Sky One is flying above SHADAIR, Peter spots the UFO at 12 o'clock. He then tells SHADAIR they're the target. Peter's next two close-ups are flipped shots. Note his facial scars and helmet microphone. (00:32:35)
Deliberate mistake: After Straker shoots Turner, he slumps over in his HS mini car and it goes around in circles. Then, the last shot of Turner is a flipped shot; note Turner's uniform patch and the car's backwards HS. (00:46:05)