Let me see if I understand this scenario: Duke the plumber (with his now-trimmed beard) arrives from the now-named De-Bait Team Fishing Club (formerly the De-Bait Team Fishing Lodge) and announces he brought along his plumbing supplies, as requested by Mark. 

Why would Mark have to specifically request plumbing supplies? Did Duke bring his fishing equipment on a prior plumbing job?

But isn’t Duke just one of the in-house fishermen over at the Lodge, er, Club? Sure, but he’s not just a weekend plumber. He has his own business truck, as seen in the background, with the leaky shock absorber. Perhaps that is why Mark and Cherry are going to get stuck with a big bill.