When the Doctor signals to Dottie in Morse code, you can see her looking down at the paper to write. This is the first thing you learn not to do when signaling Morse in the optical medium since it could make you miss a single dash or dot which is a critical mistake.
When Daniel Sousa is looking for Dottie Underwood in the building across the street from the SSR's main offices, he enters office #1317 indicating he is on the 13th floor. However, when Dottie comes out of an office on the same floor, the door clearly shows it's office #310 ...which would normally put it on the 3rd floor in any other building.