Am I the only one that kind of wished they showed a bit more of Jacques's backstory? Like, how he met Lena and Simone, why they decided to recruit him rather than drain him (he could've very easily betrayed them at some point, drained them of their life forces).
Sort of in that same sense, I'm a little irritated that the fisherman served as little more than a red herring for what was really going on. I realize that that's standard Scooby Doo formula (one or more person/people did it, another was good all along and their suspicious behavior was justified, and/or another was just acting normal if unpleasant) but it still felt like his scenes did little more than pad the movie.
For that matter, why didn't Simone and Lena ever think of taking his life force? He's close enough to them for Scooby and Shaggy to have another encounter with him while on a picnic at the plantation.
Did Simone and Lena always plan on draining Bo's life? Was it like with the spice traders, they served one purpose for a time, then when the harvest moon came they served another?
Why didn't Beau just tell Velma about the quicksand? I know he tried to stop her and she was all "Hey, let me go!" But he doesn't even say "Wait, stop!" or "Don't go that way!" or the more ambiguous "Hold it!" He just grabs her, and when she doesn't take kindly to being grabbed, he raises a huge rock over his head like he's about to kill her.
In fact, he grabbed her twice, the first to interogate her about her suspicions, and the second about the quicksand. After the first rough grab, it's no wonder Velma wasn't willing to tolerate the second time.