Near the end of the fight between Sarah and Malena, Malena pulls a straight knife from her boot. In the close up, the tip of the knife is clearly bent.
At one point, Chuck gets a stain on his tuxedo shirt. In a later scene where Chuck's shirt is visible, it shows no stain.
The character of La Ciudad is described as a man until we meet the character and see it's not a man but a woman. The word "La" is feminine in Spanish while El masculine. The use of "La" should have given away the gender of the target, especially for a show which takes place in Southern California.
At the Madrid Barajas airport the Range Rover being loaded with the painting has California license plates.