Other mistake: They search for the location of the Village by using map co-ordinates, which are checked out using a military aircraft. The Village is eventually discovered and found to be on an island somewhere in the Mediterranean sea. Number 6 is ejected from the aircraft back to the Village. However, in the final episode, i.e. 'Fall Out,' the Village is found to be in somewhere in the UK. They escape in a truck and end up traveling to London.
The Leeches - S1-E4
Other mistake: David Vincent arrives at the airport and a sign says "Welcome to San Diego", but the episode takes place in Arizona and references Arizona-related locales: Tucson, Maricopa County, etc.