Reed gets in the cab through the left door; then we see him inside sitting on the right side of the taxi and the girl is on the left.
Black umbrella in stand disappears for no apparent reason after clearly being in place for at least four shots prior to the disappearance.
During the cab chase, Vicky and Robert's cab stops and Vicky says, "Oh Robert, we've lost them!" While the shot is from outside the cab and at a distance, Vicky's mouth is clearly visible, and clearly not moving.