Over the last 4 series there have been mistakes that the directors didnt think we would noice but we did:
In the first ep we saw Lex read of the wall that the Locos were 'Scandolus' yet later on in series 1 we find out that Lex cant read or write?
When Bray enters Trudy's room, Trudy threatens him and holds up a plastic knife yet Bray backs away from the 'very scary and dangeous PLASTIC knife?'
In the ep when Lex is deciding weather or not to kill bluebell he flips a coin wich is a ENGLISH 50p coin but in New Zealand the currency is the New Zealand dollar?
In series 3 Jack gets caught in the sewer after trying to escape from the Chosen thorough the vents but a few eps later we find out that the chosen haven't even dicovered the sewers yet?
In the episode when they decide to hold the election for city leader the posters of the candidents are up before it was decided