The Maihaugen open air museum is definitely worth a trip while in Lillehammer. According to their website, more than 200 houses are recreated from a number of periods, as early as 12th century.
Part of the trip involved reenactments from period actors in the ‘open houses’. For example, if you go inside a house there would be a person from the period talking about baking cinnamon rolls but she would provide a recipe for the time. There was also another actor from the 80s, including wearing 80s make-up, talking about their life to the visitors. If you ask them questions, they would answer as suitable to the time. For example, ask a 1950s ‘resident’ of the open house a question about fiber optics and they would not know how to answer.
The overall tour took about 2 to 2.5 hours.