* All swearing in the future will be done in Chinese
* The terraformed planets will mostly look like the undeveloped land outside Santa Clarita
* There is a lot of steel on spacecraft of the future that will be cut with oxy-acetylene torches
* ATV technology doesn't appear to have improved since 1980
* Stray bullets do not pierce external spacecraft walls when it would interfere with the plot
* Prostitutes with all their teeth are highly regarded professionals
* Believe in Iron Age religious fables is still not universally ridiculed