Edit: Spleling
I don’t understand how cereal box puzzles would translate over to DnD.
I also don’t know about ripping off movie and TV characters and just swapping out the names. I suppose it depends on the character, but I feel like this is the easiest one to tell that it was “stolen”.
Using Pokémon descriptions for monsters is aces though, even if you use the older mons. I think Monster Hunter monsters would also translate over pretty well.
During a game of Star Wars d6 rpg i ran a group through basically the train job episode of firefly (that was in solo 12 years later) and they did not realize it until we were watching firefly together. I also ran them through the cloud city plot from ESB while they were on cloud city.