The one with the Central Perk logo

Have you noticed that in S1E1, the pilot episode of Friends, there is no logo on the window at Central Perk?

Chandler, Phoebe, Ross and Monica in the sofa of Central Perk. Look at the window
Episode 1, Season 1. No logo on the window. And, no small coffee cups on the door window.

The logo that says «Central Perk», where «central» is written in red on a slightly yellow background, and «perk» is written in white on a green background, with one coffee cup on each side, is not on the window in the pilot episode. Neither is the gray-ish film that is on the window in the episodes from S1E2, to prevent people on the outside from seeing directly at the people inside.

Chandler, Ross and Joey at Central Perk
In episode 2 they now have logo on the winow, and coffecups on the doors 🙂

And, another strange fact about that logo is that you can see it the right way, both from the inside, and the outside.

Why do they need to have the logo readable from the inside?

Central Perk exterior shot

(PS: I know a lot changes from the pilot episode, and that the pilot is one episode that the producers use to pitch the idea and stuff, but this page is called FRIENDSFACTS, and this is a fact 😉 )