Lambs Bottom Road (or indeed Lambsbottom Road) doesn't exist in Bristol and if it did the road sign would have a red 'BSx' designator, where 'x' is the zone.
After Frank asks the barman for a 'Mai Tai', he says hello to two women and asks to join them at their table. They ask him to buy them drinks first. He then says to the bartender "Three Mai Tais" but holds up 4 fingers.
When the group enters Lambsbottom Road, they walk in the middle of the street rather than on the sidewalks.