What filler snafu? Did you see the same episode I did? There was a ton of development (and a ton skipped).
I get that there was development, but it still felt kinda like filler (not full on filler...just "kinda filler"), mostly because there is a plot going and they were like "hold up, pause the plot. We are going to a theme park for some reason!". I'm not going to complain about it this week though. Like I said, I enjoyed the episode, even if it felt out of place.