At the end of each episode of Arrested Development, there is always a segment which is introduced by the narrator as "in the next episode of Arrested Development...", however the scenes shown during this segment very rarely actually appear in the next episode.
At first I thought that perhaps some of these scenes were cut out of the next episode during subsequent editing, but as the seasons progress it becomes apparent that very few of the scenes shown in this segment actually appear in the next episode.
What is going on? What is the purpose of introducing these plot elements in this way if they're not actually shown in the next episode?