1 Episode 1. First season. A view from Perry's
private office straight through Della's office to the
outer office. All three doors nicely aligned.
Picture 2 Episode 46. Second season.
A view nearly straight out Perry's door showing that
Della's outer door has shifted to the left.
Picture 3 Episode 204. Seventh
season. The shifted door configuration is seen often and
persisted through the series.
Picture 4 Episode 10. First season.
The protruding corner that was present in Della's office
when the doors were aligned.
Picture 5 Episode 53. Second season.
The protruding corner has gone away. Everything on the
wall logically shifted to the left..