Ron Howard and Don Most after three years of absence returned as their characters in the Welcome Home two-parter. However, while Most left permanently after that, Howard got to appear one last time in Passages: Part 2.
The last new episode chronologically. The rest of the episodes were burned off during the summer due to preemption from the 1984 Winter Olympics.
The last episode of the series.
Howard thanks his two children, forgetting older brother Chuck Cunningham completely.
Even though Joanie gets married in this episode, subsequent episodes do not address the marriage and she still lives at home. This is due to those episodes chronologically occurring before this one, which is the official series finale. They were episodes from the season that for whatever reason went unaired until they were run as summer "filler" later in 1984.