Other mistake: When the girls steal a cab, there are some bystanders on the curb opposite to them. A woman next to a guy with a hat points at the camera for several seconds (for it's not a plot-wise movement).
Continuity mistake: When Lagrange finishes dancing with Argylle, she places both hands around his back, the left over the right. A shot later, they're placed the opposite way. (00:02:10)