Continuity mistake: When Maggie walks away from the car accident, the blood smears on her white gown change repeatedly from shot to shot. (00:16:30)
Continuity mistake: When the old man dies and Owen is trying to revive him, the position of the man's head changes several times between takes, from lying flat to propped up on the pillow and back again. (00:37:00)
Plot hole: Owen is unable to give Henry the kiss of life as he has no breath, and yet he is able to talk.
Answer: Several times during the episode, most notably at the beginning when the old grave is discovered, Tosh holds a devise that looks a great deal like the Sonic Screwdriver that she uses to determine the age of the skeleton. However, a search of Google images shows that it is not the same thing.
OneHappyHusky