Why did they skip 2 episodes?

I'm wondering the same thing. I've been recording all the episodes and noticed those two (one complete episode) was skipped. What's even weirder is, they aired/are scheduled to air the two episodes that weren't included on the Season 4 DVD set (for unknown reasons) - Doug's Bum Rap (already aired) and Doug's Babysitter (scheduled to air). So, why they would air THOSE but skip 2 others, I have no idea. If they don't change their upcoming schedule, Doug is supposed to start from the beginning again after they air the last one and maybe we'll get it during their second run. I hope they air the Halloween episode and Christmas episode in the coming weeks, too.