I watched the same episode....I didn't notice anything, but I DVR'd it (one of my favourite episodes) so will have another look...annoying if they did!
Enterprise C episode is "Yesterday's Enterprise". The character Tasha was also in the finale, "All Good Things...".
Boy, if they're pixelating dead eyes, I hate to se the conundrum they get into if they ever air the season seven episode of "Buffy the Vamprie Slayer" when Caleb gets ahold of Xander and, well...