This is the only episode in the entire series where Charlie's voice is not heard.
Déjà-vu for Kelly Garrett: just over two years earlier, Kelly escaped through another skylight, in season two's Angels on Ice (1977).
After Kelly leaves Guido's the first time to head home, there's a shot of her driving past a Firestone tire shop - it's reused footage from season two's Angel Blues (1978).
The location of the prison gate in the opening scene is the same location used for the entrance gate to the 20th Century-Fox studios seen in season 3 Marathon Angels (1979), where the marathon runners enter the studio lot.
Cameron Mitchell (Frank Desmond) later appears as a different character in season five's To See an Angel Die (1980).