Several changes were made after the pilot, e.g. Ned's apartment number changing from 27F to 17D, the level where his appartment is was redecorated (different positions of doors, walls and most notable the elevator); in the pilot Eric and Amanda have more than one kid (as in later episodes).
I'm looking for my mother. She said if I get lost I should stand next to the pretty bee.
Girl: Interesting line.
Ned Dorsey: Well, it usually doesn't work. Good thing you're dressed like a bee.
Often, at the end credits, outtakes or another version of a previous scene is added.