I noticed it too. It didn't stop me watching it though! Weird is all I can say as disks 5 & 6 were 'normal', perhaps it is a production error.

I liked all of it, but I remember season 3 having that KARR / KITT story & me arguing with my mother who wanted to watch something on another channel (no VCR in those days!). I was about 11 or 12 when Knight Rider was 1st shown in the UK. I hope seasons 3 and 4 get released on DVD soon, I'm real...