Supernatural Season 4 Error? - Please Help!

[Darkspecter]

Hi there. I noticed a strange error in two episodes of Season 4. In certain scenes a bluish purple line goes across the bottom of the screen. I can only recall one of the two episodes though:

Disc 1, Metamorphosis, timecode: 02:34:01

It shows up in almost every shot the man's wife is tied to the chair in her extreme close-ups and regular close-ups.

The other episode it shows up in (I forget which), the bar is thicker and brighter. I believe it's in a scene with Sam and Dean talking and they are getting close-ups. Again, it only shows up for one of the two brothers (just like the wife in the other episode).

Can anyone who has this season please check out the scene with the wife and check if they have the bar? If not, I'll try to get a replacement disc.

Thanks guys!