They had a projection screen behind them and used this to display images meant to be wallpaper of the house in which the scene was set . They also used it to very amusing effect with a few animated images and swapping images in and out during the sketch as part of the gag or plot . Towards the end McKinney came out with a videocamera and panned it over the audience for a bit and it projected on the screen .

Question: Why were some amused by the images ?
Answer: The photos were unusual .They were projected in a unique way .None of the above choices .The photos were surreal .