Visible crew/equipment: When the severed head in Nora's suitcase has vanished, she shouts for everyone to get out and leave her alone. In the hallway when they disperse, as Loren and then Trent walk past Lance, something that shouldn't be there (it looks like fingers perhaps) pops up into view at the bottom, left corner of the screen. This is clearer in the colorized version of the film. (00:49:00)
Visible crew/equipment: After the caretakers have gone before midnight, Annabelle tells Frederick that he should get some cars for the guests, and just as she says, "Let them go home, but pay them first," the shadow of the boom mic can be seen moving above the doorway, at the top of the screen. This is more noticeable in the colorized version of the film. (00:37:05)
Chosen answer: As far as the "gliding in and out", Mrs Loren presumably uses the same body harness she used to fake her hanging. As to the rope... the film is deliberately ambiguous on whether or not the ghosts are real, as evinced by the drunk's last line in the movie; the rope trick is probably supposed to reflect this ambiguity despite being Mrs Loren's trickery.