When Piz (Christopher Lowell) throws the bowling ball the first time, you can see it's headed straight for the left gutter, yet somehow it ends up in the middle of the lane to knock eight pins down.
Around 32:40 you can see someone, presumably a crew member, walking around behind the basketball hoop, up near the workout machines.
When Mercer (Ryan Devlin) introduces himself to Parker (Julie Gonzalo), she doesn't reply with her name, and yet as she leaves, he says, "Nice meeting you, Parker."
Veronica asks the hotel receptionist if she can leave her number and be notified if Rory Finch ever checks in again, but she doesn't actually give her the number.