The presence of rapidly fading sparkles in a room means Glimmer has just left. They don't leave a mess, at least!

Glimmer habitually and frequently teleports between floors, carriages, and generally all over the train, but not outside of it; it takes very little effort for her to do so, and she's capable of taking multiple people along with her. If she's excited, she won't ask.

This also means she's able to enter other people's cabins without a ticket. Currently this has a self-imposed limit of 3-B and 3-D (hers and Catra's rooms) because she doesn't know anyone else that well yet.