The Combat Action Badge on Ted Mendez' uniform is in the wrong spot. It should be above the ribbons, not on the pocket flap.
In the Vermont mission, there are wind turbines inside the town proper. Commercial grade wind turbines are not usually found within inhabited areas due to the danger of them coming apart in extreme wind conditions.
The outhouses do not have enough room in them to possibly hold an occupant.
Everybody in every country speaks fluent English with North American accents.
In the subtitles, Ms. Burnwood refers to her mother as 'Mom'. In the United Kingdom, the correct spelling is 'Mum'.
Ms. Martinez states that her cement mixer is brand-new; however, there is a great deal of rust upon it which suggests to the contrary.
Agent 47 does not change his accent when disguising himself.
The American cars have European plates mounted upon them.
The cars in Florida have EU-style license plates.
Agent 47 can shoot cameras in order to avoid the attention of security; if this were done in a real-world scenario, the operator or operators of the cameras would be alerted that something was amiss.