"Jericho" was full of blunders---not really "tech", but just plain old general knowledge.
It was supposed to be set in a rural community, but the characters gave no indication of the kind of knowledge widespread in such communities.
In one egregious example, a group of "heroes", told that the hospital EPP was running out of fuel, set out to salvage "gasoline" from cars immobilised by an EMP.
To this end, they grabbed a flat tray truck, found a large plastic tank somewhere, & headed off.
Why plastic? ---Their explanation was to avoid an explosion due to static electricity.
Well pardon me, "Mr big city scriptwriter", but this "ole country boy" has only seen "gasoline" transported in large steel tanks or in what we, in Oz call "44 gallon" drums, & plastic is well known for the possibility of static discharges.
"But wait---there's more!" as they say in TV ads,
When they get enough "gas", they very deftly pour it into the
sump of the EPP.
Of course, EEPs are very unlikely to run off "gasoline", as they are almost universally diesel units, & rural areas are "awash" with diesel fuel, so going around milking random car tanks would not have been necessary, even had they got the fuel type right.
A farmer isn't going to drive his huge new tractor into town every time he needs to "fill up", so farms will have bulk supplies, even ignoring that in the tanks of their newer "high tech" equipment, supposedly immobilised by EMP.
Another source would be the large tanks in the locomotive/s drawing the stranded train, which was visited to salvage food, dunny paper, & whatever, in an earlier episode.