Simpsons Illustrated was an official Simpsons magazine that went on for 10 issues in the early 1990s. Each issue featured exclusive Simpsons comics, news, and pictures of people who worked on the show (Disclosure: the header and title of IN THE NEWS is an, er, homage to this magazine). It was the forerunner to Bongo Comics Group and the Simpsons Comics series.
In 1992, they did a special 3-D issue featuring a barbecue-themed comic with an interesting moment:
Yes, Lisa requested a vegetarian alternative three years before becoming a vegetarian in the 1995 episode “Lisa the Vegetarian.”
Was this quick moment merely an indication of Lisa’s multiculturalism and non-conformist personality? Was her character so predictable that it was assumed she’d eventually turn vegetarian? Was it simply to set up the use of a long prop, in this case a shish kebab, in order to take advantage of the 3-D gimmick? Or, more likely, did the writer of the comic have access to Simpsons episodes from the future, thus allowing him or her to retro-plagiarize “Vegetarian” writer David X. Cohen?
You can read the whole issue over at the astoundingly comprehensive Spanish Simpsons Comics blog Tebeos de los Simpsons, including an early comic version of the Hey Arnold! pilot.