doubleofive said:
Or not have everyone be an expert at every point in human history.
It was really funny seeing the DS9 crews shocking lack of knowledge about the 23rd century in Trials and Tribbleations. From presuming the turbolifts work exactly the same, to trying to order Raktajinos, down to mistaking a crewman for Kirk! It's a wonder Sisko was able to use a console on the Enterprise bridge. ;)