Older Denise Christopher has a bit of an Indian accent when she speaks, but the young Denise does not.
The shot of the sleeper agent walking around a corner is shown twice.
Ronald Reagan was 6' 1". The actor chosen to portray him appears to be around 5' 6".
The Secret Service agent received a radio message to look out for a Caucasian suspect with a wound from a straight razor. The razor blade shown in the bathroom is a single edge safety razor, not a straight razor. A straight razor is one where the blade typically folds into the scales like a pocket knife. They are totally different tools.
At around 29:00, Lucy and Jiya use a modern laptop to show Christopher a picture of her wife and family, yet Christopher doesn't even question the fact that it's cordless.