Speaking of Kubrick, one of the more hilarious pan & scans was the old fullscreen version of 2001 you saw for years on TV: the scene where astronauts Bowman and Poole discuss Hal's fate in the pod.
You're supposed to see both guys at the left and right of your screen, with Hal in the middle, but in pan and scan you cut between each speaking actor without seeing Hal, who we all know was lip reading all the time.
Also, supposedly, in 'The Shining', you can see the helicopter blades at the top of the shot when the camera settles on the Overlook Hotel at end of the opening credits. You can also see the helicopter shadow very clearly during those cool sweeping shots of the Volkswagen during the credits.
What's odd about 2001 is that the production stills for that film were all at the original aspect ratio, something that few other films EVER did or do today (generally they are just 8x10 regardless of the aspect ratio).