Continuity mistake: The night Krypto loses his powers, he gets a black eye on his left eye. However, the next day, the wound is gone.
Continuity mistake: Ava sees the stack of mail on the table. She sweeps her hand (fingertips and envelopes are off-screen), as she slides the top envelope closer. Ava picks up the top envelope, as if her hand sweep does not move any of the envelopes (and serves no purpose). (00:05:48)
Continuity mistake: At the beginning of the flashback in Greece, the pieces on and around the chessboard change. When we first see the board, most of the white pieces are on the back row, and then we see 2 pawns removed. In the next shot, when the king is knocked over, some of the white pieces on the back row have moved and there're several pieces that have been removed.