...And Finally: Black Bolt - S1-E8
Continuity mistake: Maximus asks Black Bolt who the bunker was designed to survive an attack from. Black Bolt signs back that hope you never have to learn who. Bolt's head is turned towards the right, while he's looking left, giving Maximus the side eye. Then in the next shot, Bolt is looking directly at Maximus. (00:37:25)
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.