For example, util the real Kramer consented to the use of his name on TV, Kramer was briefly named Kessler and Jerry called him that in the pilot that aired. (via Laughing Squid)

http://feeds.boingboing.net/~r/boingboing/iBag/~3/kWCB4qCSgpM/video-seven-seinfeld-bits-of.html