The pilot originally had no opening title sequence, and it wasn't until it was about to be submitted when the production found out that a title sequence for a sitcom was mandatory. So, scrambling at the last minute, they impulsively bought a plastic children's jungle gym and filmed Ray Romano assembling it and ad libbing lines about himself.
In the pilot episode, Michael and Geoffrey were named Matthew and Gregory, and they were played by Justin Ferreira and Drew Ferreira rather than Sullivan Sweeten and Sawyer Sweeten, who played the twins later.
Raymond and Deborah's bedroom is different later on in the season. Later there are two windows, located behind the bed, instead of the one window on the left-hand side as seen in this episode. Also, the downstairs is a lot lighter in this episode.