Here is some Wiki trivia about the pilot episode of Seinfeld, very interesting:
The Seinfeld Chronicles was received poorly by audience testing groups. Comments included, "You can't get too excited about two guys going to the laundromat"; "Jerry's loser friend George is not a forceful character"; "Jerry needs a stronger supporting cast"; and "Why are they interrupting the stand-up for these stupid stories?"[1] Other people complained that the show was "too Jewish" and "too New York".[8] Jerry was seen as naive, dense and powerless. As a result, NBC passed on the show. However, NBC executive Rick Ludwin believed the series had potential. Here therefore gave Seinfeld a budget to create four more episodes, which formed the rest of Season 1.[9] This is the smallest sitcom order in television history.[1] Julia Louis-Dreyfus (Elaine) has claimed that she was not aware of the pilot before she became a regular on Seinfeld. Out of superstition, she has claimed she will never watch the episode.[10]
When it was broadcast, the pilot received a Nielsen Rating of 10.9/19. When it was first repeated on July 5, 1990, it received a rating of 13.9/26. These ratings were high enough to secure a second season.[1] NBC research showed that the show was popular with young male adults, a demographic sought after by advertisers. This gave NBC an incentive to keep broadcasting the show.[11] One review by DVD reviewer Britt Gillette read that, "this initial episode exhibits the flashes of brilliance that made Seinfeld a cultural phenomenon."[12]
Another review of the pilot, by Colin Jacobson of DVD Movie Guide, said, "As one watches the pilot, it's hard to believe Seinfeld ever became so great. Okay - that's not wholly true, as one can see the sparks of the series' later inventiveness. However, the pilot is almost totally free from humor, as little about it seems amusing. It's got potential but little else."[13] Benjamin Willcock from DVD Active wrote that, "The pilot episode entitled "The Seinfeld Chronicles" was actually not exclusive to the show, it does not, for example have most of the acting talent as seen later on in the show, and some of the references might not make sense at first. It's still a good way to get things rolling, but for the real meat you'll want to check out the remainder of the first season, as vastly abbreviated as it is."[14]