Continuity mistake: When Nick and Audrey arrive on the island, you see Nick holding Audrey's bag. But later on in their room, the photo shows Audrey holding the bag. (00:06:50 - 00:11:36)
Continuity mistake: Towards the end of the movie, Kamala asks Carol on the porch, "Hey, do you still fly that thing?" She is holding her right hand with her left. The camera angle switches, and her left hand is low, out of frame and comes back up only seconds later after Carol's answer.
Continuity mistake: Scott hugs his daughter and caresses her face while she holds his wrist. From the opposite angle, her hand is gone.
Continuity mistake: The paramedic in the ambulance just started cutting off the patient's shirt (with some difficulty) and there was sound from the scissors snipping. After she glanced away for a second, during which time there was no sound of her continuing to snip the shirt, the slit in the shirt was about three times as long. (00:08:20)
Visible crew/equipment: As Doric leaves the house after transforming from a cat, a crew member can be seen in the background. The crew member is casually leaning against a wall, with a red T-shirt and a face mask. (00:41:18)
Suggested correction: This person is a tiny figure on the extreme right of the screen who is on screen for a fraction of a second while the camera is panning away from him. I had to watch the scene multiple times before I saw what you are referring to. Even then, he is only identifiable if you freeze-frame the picture, thus invalidating the mistake. (At normal speed, I initially thought he was a red banner or curtain).
Continuity mistake: When Aquaman places his son in the basket to change his diapers, the baby's head is turned to the left. A shot later, it's straight, and the arms' position has also changed. This changes back and forth depending on the shot.