In the episode "Hair Today Goon Tomorrow" the guy who gives Topanga his card, his hair changes between the shots, in one shot there's a piece of hair in his face and the next it's gone, and then it's back again. See more
[John Turner is in a coma
John, how could you be in here? How could you screw up on your bike? I have never seen you screw up on anything. I'm the screw-up, remember? C'mon you remember... Don't do this to me, John. I don't do alone real good... I know you're in there but it's like you're not really here. You're not talking but I know you're here. So I'm just gonna talk, you can listen.
John, even when I was at the Centre, it was all the things you taught me that made me wonder if it was...