This marks the briefest screen time for Cooper Barnes in the series, appearing as Ray for one scene in a shade under two minutes, making Rubber Duck the second episode in which Ray and Charlotte don't interact.
Except for a dream sequence in the Man Cave, the entirety of "Rubber Duck" takes place at the Hart Home.
Henry makes a mixed drink using Schneider's Sweet Tea, which is an obvious reference to series creator Dan Schneider.
"Both "Rubber Duck" and "Danger Things" parody shows set in the 1980s.
From its 2017 June 26 to June 30 production dates to its 2018 October 13 release, this episode took the longest time to air.