At around 19:50, Johnny's father is showing Johnny his cellphone as he explains that his Tinder account is lit up. The camera changes to another view, and suddenly no phone is in his hands.
Frank has a young son named Jack with Coco, who is never seen or mentioned in this episode even though Frank is near death. Johnny has met Jack, but doesn't give his half-brother any thought.
In Frank's hospital room, there's a sign on the door reading "Patient is on 1500cc fluid restriction per 24 hours" that's seen when Johnny first comes in to his room at the hospital and Nora is taking bets. But Frank is in a coma, not eating or drinking anything, so his fluid intake wouldn't need to be restricted. Also, none of his room equipment is on- he has a pulse oximeter on his finger and a monitor in the room, but it's off, and he has an IV pump that's turned off, opened up, and not hooked to anything.