The "World's Best Jacket" that Homer wants to buy has a patch of Marilyn Monroe with her white dress being blown up by a vent, taken from "The Seven Year Itch."
Episode title (both plots are about boxing)
Two of the stars of Bonanza do an appearance at the mall in costume, talk about the show and the theme tune plays twice.
Comic Book Guy talks about going to a Star Trek convention.
Lucius Sweet is seen at the IRS office
A clip is shown in a montage of Homer getting injured.
A lot of the training sequences are based on the movie Rocky, including Homer running alongside Moe, Marge asking Moe not to let Homer fight and the line "You will always be a loser".
The montage of Homer winning lots of matches parodies the similar montage in this film.