Continuity mistake: When the glam cab stops at the cross roads to "steal" the passenger from the speedy cab she pulls up next to a tree that is obstructing her car's rear door, but when the passenger gets in her car it is forward of the tree.
Continuity mistake: When we first see pintpot driving the taxi (just before he nearly runs over the man) in the shots from inside the taxi they are driving along a tree lined road, but in the exterior shots they are driving along a road with houses on both sides.