Owen Harper's Torchwood officer number is 565 and his age is 27, as reported by Dr. Martha Jones at the beginning of his autopsy.
Writer Matt Jones had originally written the tarot card girl as having a glass of whiskey and a cigar at her table to show that she was ageless and immortal, but executive producer Julie Gardener deemed it inappropriate.
John Barrowman, who plays Captain Jack Harkness, was born in Glasgow, Scotland, UK, but speaks with an American accent due to his US upbringing. Burn Gorman, who plays Owen Harper, was born in Los Angeles, California, USA, but speaks with a British accent due to his UK upbringing. Essentially, the American sounds English and the Scotsman sounds American.
At 24:22, while Jack and Owen are surrounded on the upper level of the car park, just behind them, under the guardrail, a four-legged creature can be seen walking past. It can only be seen for three seconds and appears to be a cat or opossum by how it walks.
This episode takes place in 2008.