When Elmer reads a newspaper from the year 2000, there is an article with the headline "Bing Crosby's Horse Hasn't Come in Yet". Crosby was well known as a horse breeder whose horses seldom finished in the money, and the line "Crosby's horse finally came in" was a popular gag line.
Musical Director Carl W. Stalling's name appears in a newspaper article Elmer Fudd reads at the beginning of this cartoon. The headline reads, "Smellevision Replaces Television" followed by the byline, "Carl Stalling sez, 'It Will Never Work!'"
On the front page of the "Daily Rocket" newspaper is the "far into the future" date of "November 2000," just barely discernible at the upper left.
At the end, Bugs Bunny says "Well now, I wouldn't say that." This is a reference from one of the characters from the old time radio show, The Great Gildersleeve, the druggist Mr. Peavey.
Television was not yet a staple in American homes at the time of this short, it was still WW2. But the concept of scents and film was a concept that was tried in several movies. The most famous was the 1960's film "Scent of Mystery." The process was not a success, and has been the subject of a 21st century documentary. The scent in cinema idea is also being re-imagined for future use as well.