A couple of episodes ago, when Jerry's parents first came to town and Jerry remembered throwing the watch into the trash can, they showed a flashback of Jerry doing so. I don't know what the correct tv term for this is, but I call it a flashback. I HATED IT. One of the reasons I watch the show is that the references to past shows aren't forced down your throat. I just started reading this newsgroups (didn't know it was here), and hope this hasn't been talked about yet.
Just off the top of my head, one of the funniest past-references was when George revisited his mother in the hospital to find the male nurse giving the male patient a sponge bath. Remember, this happened in the episode where the student reporter thought Jerry and George were gay. The first time George visited his mother in the hospital, when she caught him masturbating, George saw a female nurse giving a female patient the sponge bath. Anybody else??
Tom Mahaffey