We can assume that the film is set in 1983 as one of the songs featured is "One Thing Leads to Another" by The Fixx. See more

Goofs

When Samantha grabs the pizza, she holds the box vertically. This would cause the pizza to "collapse" inside the box. However, when she opens the box, the pizza is flat. Also, it appears as though a piece of the pizza is missing. However, what appears to be a missing piece is actually a part of the pizza that had shifted and collapsed when she held the box up See more