In the shootout at the end Monica's pistol is shown being empty after only firing five shots. She carries a SIG Sauer P228 chambered in 9x19 mm, which has a magazine capacity of at least 10 rounds, typically the FBI issues them with 15 round magazines.
The posters strung across the road on a wire do not cast a shadow on the ground, but the wire does. These were added in CGI and they forgot the shadows.
At the very end of the closing scene, a shadow of the camera crane is visible on the far left of the screen.
Reyes doesn't speak Spanish like someone who grew up in México; her accent is way too obvious.