When Uncle Dudley becomes Captain Bamboozle, he wears Captain Marvel's original costume. Captain Marvel himself wears the new costume he got in the 2011 DC "New 52" comics.
Uncle Dudley tries to get Billy to go on a road trip with him in his RV. This is a homage ti Shazam! (1974), where Billy traveled around the country in an RV with an older gentleman called Mentor.