The Leg Lamp became a real product in 2003 when a fan of the film started manufacturing real lamps for sale. This then led to....
...the fan using the money he made from his business to buy the house in Cleveland that was used for exterior shots of Ralphie's house. He later dropped another quarter-million dollars to gut the house and remodel it to look like the sets that were used for interior scenes. The house across the street has been turned into a museum and Leg Lamp giftshop.
At the time the movie came out, some people were thinking "Messy Marvin!" when they saw Ralphie.
The Red Stapler: You can now buy a leg lamp. The Red Ryder BB gun is an aversion, however; while now available, they were produced throughout the 30-odd-year gap between the end of the Red Ryder Franchise and this film's appearance.
Not the particular model described in the film, however. note The Buck Jones air rifle has the compass and sundial in the stock, but none of the features of the Red Ryder. A special model was made for the movie to match Jean Shepherd's description in the story. While it may be Artistic License, it is the configuration Shepherd claims to remember.
Vindicated by Cable: Only moderately successful at the box office when originally released, the film achieved Cult Classic status in the late '80s thanks to TV and home video.
What Could Have Been: Jack Nicholson was apparently a fan of the short-stories, and really wanted to play Ralphie's Old Man (he was even willing to take a paycut if necessary!note This is the same guy whose salary consumed the bulk of the budget for Batman.). However, Jean Shepherd feared that the presence of such a high-profile actor in a supporting role would distract people from the main story.
In hindsight, it's hard to see anyone other than Darren McGavin in that role.
It would also be hard to see Nicholson swearing at the furnace being dubbed over by gibberish.