Re: The Twenty Worst Science and Technology Errors in Films.
I was always troubled by the uniformity of alien planets. The aliens all had the same language, religion, physiognomy and were one planetary nation.
No I know it's a simplifying assumption but given the diversity of Earth; constantly landing on the planet Easy to Explain, becomes unlikely.
... I know Star Trek and a couple of others on rare occasions gave a planet as many as two races/religions etc.