Seinfeld Easter Egg - The "Signfeld" Company

Jerry Seinfeld's real dad used to own a sign-making company, called Kal Signs. In the first few minutes of a few of the episodes, if you look behind them when they are walking down the street, there is a sign for Kal Signs. Gee, I wonder why that was there? Considering that that that whole set of the street is fake.

[Correction by Elisson: Jerry Seinfeld's real dad's name was Kal Seinfeld and his sign company was called "Kal Signfeld Signs." The sign on the set was an obvious tribute to Jerry's dad - even if it didn't use the actual name of the sign company.]