At a certain point in John Wick 2 during the catacombs scene in Italy, Wick's shotgun jams and he has to eject the shell. However, prior to the jam, there is clearly something red hanging off the shotgun that looks like a shell for several cut-scenes.
Was this a production sequencing mistake and the jammed shell was already 'stuck' in there so that he just had to rack it out? Not sure how difficult it is to intentionally stage a jammed shell.