Factual error: In the episode where Kat is flying off to Ibiza, she is seated in an over-wing exit seat. These seats are reserved for ABP's (Able Bodied Passengers) which mean no children or infants under the age of 14 can sit there. Once the plane has started boarding, check in closes for that flight and no further tickets can be sold for that flight. The captain requested pushback, but, certain conditions around the aircraft wouldn't make this possible. Stairs still in place, ground power was attached and once the door had been closed Alfie would have not under any circumstances been allowed onto a airfield to climb the stairs. If he did, he would have been escorted off.
Continuity mistake: In the episode where Lauren and Joey take Derek Branning's car and crash it into a shop, before the car crashes, as it speeds through the streets there are no hubcaps on the car, but after the car has crashed into the shop it has them.
Continuity mistake: 12/4/13: When Sharon claps her hands to get everyone's attention to tell them that her and Jack are not getting married, look at Kirsty - she is looking at Sharon over her right shoulder, but when the angle changes Kirsty is facing forward, and then turns her head to look at Sharon over her right shoulder again.
Other mistake: Friday 12/8/11 Greg leaves for his holiday in Mexico by taxi. After he has gone you can see his pick-up truck parked in front of Dot's car in the square. On Monday 15/8/11, Greg's truck has gone.
Answer: Albert Square is a set in the BBC studios in Borehamwood, on the north side of London. The trains, to the best of my knowledge, are simply a bit of the old TV magic. As far as the extras go - it's not difficult to get extras in reasonable numbers through agencies.
Tailkinker ★