- An unintentional one, but the sounds the birds - which look like hawks or Aquila eagles - produce are made by Bald Eagles. Due to the rather annoying and unimpressive nature of the Bald Eagle call, they are dubbed in fiction with the cries of other birds of prey. So basically, not only is that is that situation reversed here, but in a way it's very karmically appropriate.
- Ramsey is an Iraq vet who clearly has some sort of PTSD disorder, he spends the film running around in military fatigues and combat boots, and he had an assault rifle and several pistols in his creepy van. If the bird attack didn't occur, it seems quite likely that he was getting ready to do a mass shooting sometime soon, or is at least a very dangerous and unstable individual.
- How in the world did Rod lose his car keys? He never left the hotel room.
- Maybe he dropped them down a sewer grate. Or hell, this is Rod we're talking about. They could have been in his other pocket.