Continuity: In the church scene Bishop is working on a crossword puzzle. He looks up from it to talk to the cop and when he looks back down at it there are a lot more blanks filled in, especially in the upper right corner.

Other: During the film Ethan Hawke's pills are talked about between him and his evaluator. When you finally see him open his pill container, it is clear that the pills are actually Ice Breakers breath mints. You can see the trademarked "Flavor Crystals" (the dark blue spots on the white mint).

Deliberate "mistake": In the scene where the group finds out that Jasper has betrayed them and then Bishop uses the flash-bang, the group splits up, and Iris and Capra get into an SUV. Very shortly later, when it goes out of control and crashes, you can see a stunt driver in the SUV wearing blue elbow pads and holding onto the roof, before the SUV hits the ground. (Slo-mo may be necessary.)