Starring: John Barrowman, Eve Myles, Gareth David-Lloyd, Kai Owen
Continuity mistake: When she sees the little boy's ghost, Gwen's hair alternates repeatedly between neatly-combed and windblown/messy, depending on the shot. (00:03:30)
Revealing mistake: From the first "front on" view of Gwen and Owen in the arcade as they are running to catch the alien device, you can see behind Gwen to the right that Owen is being played by a stunt double.
Captain Jack Harkness: Captain Jack Harkness, note the stripes.
Captain John Hart: Captain John Hart, note the sarcasm.
Captain Jack Harkness: Hey, I worked my way up through the ranks.
Captain John Hart: I bet the ranks were very grateful.
Trivia: Torchwood is an anagram for Doctor Who, the show of which this series is a spin-off.
Question: How did Jack get the Doctor's severed hand?
Answer: He might have requisitioned or stolen it from Torchwood London, or he might have been ready down below once it'd been severed, searching for "the right Doctor" and not knowing that the newly-regenerated Doctor was the one he was looking for.
Captain Defenestrator