Other mistake: When Lydia tells the ghost Nadia that she's having a "really shitty day" with her back to the camera, you can see she's not really talking and is actually putting a pill in her mouth. The dialogue was just dubbed over it. It then cuts to a different angle and we see her repeat the exact same motion as she takes the pill a second time between cuts.
Visible crew/equipment: When Beetlejuice is first introduced, right before we see him, the camera rotates around the model and the sign above the grave lights up. Right before the sign lights up, you can ever-so-subtly see a part of the camera's shadow move over the model. It's subtle and easy to miss, but once you see it, it's pretty obvious.
Revealing mistake: When Wolf Jackson touches a headstone as he and the police are about to raid the church, you can see the headstone wobble when his hand lightly touches it, revealing it to be made of a soft, perhaps Styrofoam-like material and not a real headstone.
Continuity mistake: When Lydia first meets Delia, there's a man in the glass box behind her walking around. Between cuts, he suddenly moves back about five feet.
Continuity mistake: When Rory finds Lydia's pills and says "No," Lydia's mouth goes from closed to open between cuts.
Continuity mistake: When Rory is first seen at the studio, suddenly an extra production assistant appears behind him when it cuts from the medium shot to the extreme wide shot.
Continuity mistake: When Lydia introduces the guests on her show at the start of the movie, the way the woman is holding her dog "Taco" changes between cuts. (The dog goes from facing Lydia to facing away between cuts.) This sort of mistake happens several more times over the scene.
Answer: My guess would be that it's a combination of a few factors. The first is that she's far from the only one doing that sort of program. There are hundreds of paranormal shows, YouTube channels, etc. It would start to look very suspicious if suddenly things started happening to everyone who makes that type of content. Second, a lot of people just flat-out don't believe in things like ghosts and the afterlife. And a lot of those shows are faked, anyway. So while Lydia is earnest and honest, a lot of people won't believe it. Therefore, her show isn't exactly super risky for the afterlife. And finally, the original movie really doesn't dwell on that idea; it's basically given a few brief lines of dialogue in like one scene, and that's it. So you could also make the argument that this movie just sort of ret-conned or is ignoring that idea due to it being such a minor, unimportant element of the original.
TedStixon