Stupidity: Medusa is the queen of the secret kingdom on the moon. She knows that they are very secretive and keep hidden from the humans on Earth who would have no idea who she is or that there are secret people on the moon. And yet in Hawaii, she walks up to an ATM and tries to demand by voice commands it give her money, saying, "I am Medusa of Attilan, and I need money." It is extremely stupid of her to think a random ATM in Hawaii would know who the secret queen of a secret moon base is.
Plot hole: In Agents of S.H.I.E.L.D, Gordon's teleportation ability is tied to sensing and linking with other Inhumans on Earth after their Terrigenesis. Yet in Inhumans, members of the Royal Family such as Triton travel to Earth. If Gordon's powers truly let him detect Inhumans, he should have sensed Triton's presence once he arrived. The show never explains why Earth Inhumans and Moon Inhumans can't detect or acknowledge each other, making this a continuity gap between the two series. The Inhumans reference the Terrigen being set loose in the Earth's oceans at the end of S.H.I.E.L.D season 2, meaning this show takes place at the same time as S.H.I.E.L.D season 3, and there is continuity between them. Yet somehow Gordon is unaware of the other Inhumans from the moon.