There is a calendar over Dameran's table that shows February 82 ending on a Thursday when, in fact, it ended on a Sunday.
The desk calendar Stan flips through has two February months in a row.
The February calendar Stan flips through is not from 1982. In 1982, February 1st fell on a Monday as opposed to a Friday.
The "Tab" vending machine has a dollar bill changer on it. Vending machines didn't have them then.
When the younger Elizabeth approaches the window holding the baby, the focus-puller's arm is clearly visible reflected in the glass.
When Nina is writing up her report on her meeting with Stan, she misspells the Russian word for "questions".