When Rosen picks up the quarter from the chess table, it's one of the state quarters (Virginia). Assuming Rachel is analyzing the same coin, it's mistakenly switched to an eagle quarter.
When Rosen is talking to Marcus outside the site of the fire, Marcus' collar alternates between popped up and turned down.
When holding Dr. Rosen near the edge of the bridge, the alpha (who is supposed to be perfectly accurate about such things) says (paraphrased) 'It's about 50 meters down. It would take a little over 3 seconds to hit and you would be going about 70 miles an hour when you hit.' It would actually take a little over 4 seconds to hit after a drop of 50 meters, and he would be going about 88 mph when he hit.
New HQ Is supposed to be in Queens but the address on the building is 2800 Skymark Avenue, which is in Mississauga, ON, Canada.
In flashback, Dr. Rosen is clean shaven while playing chess with Marcus but Marcus looks the same age. In the previous episode Dr. Rosen had a beard and presumably shaved his beard to change his appearance after his attempted assassination.