There's an early episode of the Jeffersons on right now, and it features an intro I can't remember seeing for years. Instead of the familiar intro featuring clips from the show, this one is a grainy film into featuring the Jeffersons following their moving van from their old life to their new high-rise.
I assume that when the show went into reruns or syndication, this intro was axed in favor of the later intro, but I dunno. It would be just like TV Land to dig out the original intro. After all, they resurrected the original intro and bumpers for I Love Lucy, which, from what I can tell, hadn't been aired since the show first entered syndication, when they were replaced by the giant "I Love Lucy" heart. If memory serves, the original animated "stick figure" intro was dumped because it displayed a sponsor's name (which would have been removed by TV Land).
Until these old intros were revived, I had no idea they'd ever existed, but I had always wondered why such a popular, and (one would assume) well funded show would have featured such a static, dull opening and closing.
Along those lines, you can't beat the original "Rock Around the Clock" intro for Happy Days, a show that had one good season, and truly jumped the shark long before Fonzie did.