The house where Meredith is kept by Cowley is the same house where the Forrest family lived in the episode 'Man Without A Past' in season 2.
The motorcycle Malenski uses is the same one that Tommy used in the episode 'Killer With A Long Arm' in season 1.
The interrogation room where Malenski is held is the same one where Bodie was held in the episode 'Fall Girl' in season 2.
In the pub the orange slice in Bodie's Harvey Wallbanger goes from being in the glass at the table to on the rim when he comes to the bar to order new drinks.
When Bodie and Doyle go into Merdith's room after he has been shot he is clearly breathing.