Colin and his boss, Mr Hart, go on a business trip to New York in July. New York in July is sweltering, with an average high of 29 degrees and an average low (at nighttime) of 20 degrees, but both of them are wearing winter coats, as are most of the people seen on the streets there.
When Colin is in his hotel room in New York, he has a bag of fast food labeled "take away." However, "take away" is a British term; Americans use "take out."
People in the bar scene around 5 minutes into the episode are dancing to Hazell Dean's hit "Whatever I Do (Wherever I Go)". It is established that this scene is set in early 1984, but this record was not released until July 1984 and is therefore several months too early.
When Jill is posting Christmas cards in 1984, the card to Gregory has a 14p stamp on it. First and second class stamps in 1984 were 17p and 13p respectively.