Venetian blinds
Many posts question why would a cab have blinds-the simple answer would be-it's a cab controlled by Jonny Friendly of course it has blinds
shareIt's actually because the film crew forgot to pay for rear projection (see Trivia).
shareNow thats not interesting.....a production problem away from the story being the answer...Technically,it might be the real reason-but I prefer to stay within the story for the answer.
A cab company controlled by John Friendly-of course there are Venetian Blinds on the back window.Countless nefarious deals could've been worked out behind closed blinds in a moving vehicle.
Thats alot more interesting than a tech problem IMHOP