A second episode, titled Cabinet, was also held back.

The episodes were ultimately held for several months due to a scheduling hiatus.

Thirty-two episodes are held by the Library of Congress.

The containers that the episodes were held in were in poor condition and the film was badly deteriorated.

The status of the NBC version is unknown; however, two episodes are held by private collectors.

Nearly all the episodes of this series are held by the National Film and Sound Archive.

Although originally produced for season 11 the episode was held over for season 12.

A few more episodes from this run are held in UCLA's film and television archive.

The numerous brief and disparate episodes "governed by their own internal logic" were thus held together by a particular editing pattern.

Five episodes of the series are now held by the National Library of Medicine.