At the Thanksgiving dinner a guy listed as Nathan's Dad is at dinner. Later it is revealed that Nathan's dad left when he was little and his mom is single.
The iced coffee on Nora's desk is full, then empty as time passes and she drank it, and then in the next scene when she is fixing Nathan's hair, it's full again.
The computer system at 11:44 lists Nathan's cause of death as "car accident", but in reality he was killed by the upload process.
Nora says she work in DUMBO, but Horizen is clearly miles away, in the Red Hook neighborhood.