All those Locks on Jerry's Door
I just started watching my DVDs the other day (after a long break) and I realized how many locks Jerry has on his door. But he never seems to use ANY of them. Kramer bursts in day and night.
Of course it makes sense when characters just walk in so it doesn't take up precious moments of an episode for Jerry to answer his door. But there are episodes when Kramer is in Jerry's apartment when he gets home. Does Kramer have keys to all of Jerry's locks?