Hellen Gravelly shows herself to be competent enough to capture Mario, Peach, and the Toads. Yet she and her employees don't seem to be capable enough to capture Luigi, despite the odds being so stacked against him. But it actually does make some sense, because the one big difference between between the former and the latter is that the former (with the exception of the Toads) have shown themselves in the past to be formidable, or at least a high priority target for any number of reasons.
But Luigi? Other than King Boo, most people tend to underestimate his capabilities due to their initial impressions of him being that of a weakling, and thus don't take him as seriously. And even though the employees do realize that he's caught onto their plan, they don't view him as being a threat because none of them have had any prior experience dealing with his brand of bravery and skill. This ends up working to their detriment once he shows that he's more capable than they realize. Tellingly, the only person who doesn't fully fall into this trap is King Boo, since he's the only one who knows that Luigi is dangerous if he gets the chance, and it's only due to his arrogance that keeps allowing Luigi to beat him time and time again.
All of the themed floors in the mansion seem appropriate to the setting of a haunted hotel (the pirate-themed restaurant has a ghost ship and the desert suites are themed around pyramid tombs, after all) except the dance hall... until you realize it's disco-themed. Ever heard the phrase "as dead as disco"? That would adequately describe the clientele for this floor. The dancers also perform a synchronized dab move, which might invoke the idea of it being a dead meme.
Chambrea is kind of annoying, since you have to chase her around the floor, interrupted each time she moves... but it makes perfect sense that the location of a fight against a maid would be multiple guest rooms, since going from room to room is how maids do their job, and it ties perfectly into the classic trope of ghosts going through walls.
How exactly did Hellen Gravely bust King Boo out of containment? E. Gadd obviously forgot to get rid of the "Release Boos" button seen at the end of Luigi's Mansion: Dark Moon.
When the Mario Bros. reach the roof of the hotel where Peach's portrait is, Mario absolutely panics upon seeing what happened to Peach. Seeing how Peach is kidnapped every other week, this should be no big deal, so why is Mario panicking now? Because for once, there is nothing he can do to save her, but Luigi can, and that's why he frantically begs Luigi to help her. In addition, Mario knows that when Bowser kidnaps Peach, he at least knows that Bowser would only hurt herif she directlyinterferes with his plansor Bowser isn't himself. King Boo, being The Unfettered and with a hateful grudge, probably would hurt Peach if it was what it took for him to win.
Most Boos, including King Boo himself in Dark Moon, stop moving and hide their face when the player approaches them. But in this game, King Boo never hides his face, not even during his boss battle. He's so pissed off at Luigi continuously foiling his plans that he managed to get over the inherent shyness of his kind.
E. Gadd states in his research journal, after the web page showcasing it is updated for Luigi's Mansion 3, that the ghosts of the original Luigi's Mansion have an energy that's "structurally different" than that of the Evershade Valley ghosts of Dark Moon. This is to be expected, actually, given the ghosts from the first game were creations of Vincent Van Gore.
The hotel is called the Last Resort, and in the final bossfight, King Boo decides to just make a huge painting to trap everyone in the hotel in a last-ditch attempt to kill Luigi. It's his last resort.
King Boo imprisons Luigi in a painting when you get a game over, even in cases where there wouldn't be any Luigi left, such as the spiked wall trap in Castle MacFrights and the ceiling traps in Tomb Suites. So does King Boo frame Luigi's ghost?
Let's hope Gadd puts every countermeasure he and Luigi can think of on King Boo's container, because considering he gets more and more psychotic with each game because of Villainous Breakdowns, if he gets out again, he'll be absolutely feral.
How did Mario know where Peach’s painting was? Was he conscious the entire time he was trapped?
Since neither of them are to be seen in the Game Over cutscene, one can only shudder to imagine what became of Gooigi and the Polterpup in that scenario.
