The Death of the Incredible Hulk

The set that was used to film the Hulk's final scene initially remained intact because of plans for a fourth post-series "Hulk" TV-movie (which had two working titles: "Rebirth of the Incredible Hulk" and "Revenge of the Incredible Hulk"). However, Bill Bixby's death prevented the proposed installment from being made.

Early on, when David Banner sneaks into Dr. Pratt's lab, he erases a letter from work board showing the scientific equation of DNA structure and substitutes the letter "A" for what he has erased. At various times during the movie, when the board is shown again, the letter "A" is in different handwriting (one must look closely to see). Sometimes the top of the letter is rounded off, sometimes it comes to a sharp point. Sometimes the two "legs" of the letter "A" are equal, sometimes the right "leg" is longer than the left "leg".

Edited from The Incredible Hulk (1977)