Apartment numbers

What is Newman's apartment number? The other night (the one with the low-flow showerheads), when Kramer knocks on Newman's door it was 5E. I could swear that Jerry's neighbor's (in the episode with the neighbors bird eating Kramers key) door was also 5E.

Anyone?

louv wrote:

You are correct. That was definitely an error. Perhaps they never thought about the numbers and some stage hand just set it up with Newman's door. Newman was always 5E as far as I know.

And in the older episodes Jerry was 3A

louv wrote: