When Castle & Becket are looking through pictures, the pair of birds identified as Red-Tailed Hawks are actually ospreys. They look nothing like Red-Tailed Hawk in size or color.
Lanie states that the bullets in the victim are from a Glock. Not necessarily. Heckler & Koch also have polygonal rifling.
When the team are reviewing the "proof of life" video on the cell phone, Dean Donegal says, "Wait. Play that last part again". Without any cuing-up, the video recording is at the correct point to play Tyler Donegal saying "Don't forget to feed Ace".
When Castle and Beckett go to the Subway station while searching for Tyler. The subway station is empty. And also not one train passes. Now this had to be at least Thursday. evening since Tyler was kidnapped Tuesday and was already missing 36 hrs. Now the A.C.E. line from Penn station has A train every 90 secs. which is just north of Canal. A train would have had to pass while Castle and Beckett were by the mechanical rooms. And Thurs would be a pretty busy day for no people to be around .