Welcome to Hotel del Luna - S1-E1
Continuity mistake: When the woman on the street greets younger Chan-sung, her right hand is raised slightly when she says "Tell me the year and hour that you were born", but in the next shot, her right hand is suddenly in her basket. (00:13:58)
Revealing mistake: The ghosts often cast shadows.
Suggested correction: You can also hear their footsteps. But I'm not sure this is a mistake, just their own perception. Within the ghostly world they appear and act just like they would in life.
The ghosts are manifestations of energy, therefore they have no physical body to block light. Even if in the ghostly world, physics are physics and there should be no shadows.
Other mistake: Curtis grabs Alisha's hand without activating her power. (00:16:45)
Continuity mistake: The crossbow at the bottom of the bed disappears and reappears throughout the movie.
Continuity mistake: When Yugi first sees the Pharaoh in the nightmare, the Pharaoh enters the frame with his left upper arm raised and his forearm pointed forward. It then cuts to a shot behind the Pharaoh where he doesn't move. When the shot cuts back, his entire left arm is pointed forward. (00:00:15)
Deliberate mistake: Leroy Hanlon has a large scar on his left cheek, but the older version of the character, as seen in It (2017), has no scar.