Help about a videogame easter egg

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Hi !

(Excuse my english in advance)

I remembered yesterday about an easter egg in a video game that, I think, nobody knows about since I can't find anything about it on the internet.
the problem is that I have seen it about 8 years ago at school.
here is the story : a game creator came one day at my school to speak about his job, told us many fun facts that happened to him, and one of them was the following :

one of his close friend had a child about to die from cancer. so he added a picture of the child (in his hospital bed), in the game he was developping, and showed it to the boy to make him smile.
the fact is that this easter egg is present in the released version of the game. but is difficult to see.

I know that the game was something like "looney tunes" or "tiny toons", but I can't remember witch one.
I am absolutely certain that it was on gameboy color.
there was 2 series of buttons to press in the main menu : the first enables the debug mode, the second shows the picture (the picture of the boy poorely photoshopped with the characters of the game)
also, I don't know if it is visible on every version of the game, but since this story happened in France, I know that this easter egg is at least in the european version.
to finish with what I know : I think that the game designer was from arkane studio, but after some reasearch, he also worked at infogrammes.

so my questions are :

1 - Is it possible to reverse ingeneer the rom of the game to find a way to reproduce the easter egg ? or search in the rom for something that looks like a full screen picture ?
2 - Is there a forum or a board full of "easter egg hunters" that would be happy to search for it ? (since I don't have the skills to do it myself)