After getting beaten up by the young derelict, the cuts and bruises on the face of the Old Man (Harold Gould) disappear and reappear throughout the story.
In the end credits where the "generator operator" credit is listed, the word "generator" is misspelled as "generaor".
The woman and young man that the Old Man meets are described in the credits are being "in Park". But they aren't: they're in the same ruins as everyone else.