Charlie wears her "Special" adult ring on her right hand throughout most of the second half of the episode. At the 46:54 mark and for one shot only, the ring switches to her left hand then back to the right in the next shot.
When Charlie and Sterling Sr. are talking in the casino, until 13:47, Ron Perlman (Sterling Sr.) has a big black cowboy hat on, and at 13:51 when the camera pans back to him, he is not wearing a hat, and has no hat for the rest of the scene. In the brief period where the camera was not facing him, it was still showing the back of his head, so there was no time when he could have taken off the hat.
When Cliff is in the car, reciting the lyrics from Hook, a member of the camera crew can be seen briefly reflected in his glasses.
When Luca confronts Cliff at the side of his boat he says to Cliff that "we're not hear to discuss Mr Sterling's case." Sterling is the first name of Ron Perlman's character and his last name is Frost; therefore Luca should have either said we're not hear to discuss Sterling's case or we're not hear to discuss Mr Frost's case.