* CommonKnowledge: As noted on the main page, this was ''not'' the first appearance of Mickey (or {{Pete}}, for that matter). It is also a very common mistake in animation history that this short was the first sound cartoon, when those [[OlderThanTheyThink existed as early as the mid 1920's]] (and Paul Terry had taken a shot at the sound cartoon called ''Dinnertime'' just a month before ''Willie'' was released).
* CrossestheLineTwice: Animal abuse shouldn't be this funny.
* NewerThanTheyThink: Though not by much. Few realize that ''Plane Crazy'' was made first.
* ParodyDisplacement: The title is supposed to be a parody of the Creator/BusterKeaton film ''SteamboatBillJr.''
** Not only that, but the BGM at the beginning of the cartoon was "Steamboat Bill", the song that the film was named after. The tune that Mickey was whistling was actually the chorus to the song.