When Ralph made the trip in a stamp from China to Australia, he *really* needed to go to the bathroom. Now imagine Charles Merriweathe who's been trapped in the Bluenose stamp for 65 years.
While inside a stamp, you're still bounded to normal physics meaning you can get burned, ripped to shreds, thrown in the garbage or being stuck inside a stamp collection forever.
Ralph is very lucky that he ended up in Tommy's hands after getting thrown in the garbage. He likely would've rotted away in a landfill otherwise.
Hollywood Pudgy: In Tommy Tricker and the Stamp Traveller, Tommy refers to Albert as "fatso" a few times, despite the fact that Albert is in no way overweight. Unless, of course, Tommy was just poking fun at Albert's name.
Memetic Mutation: "La guerre, la guerre, c'est pas une raison pour se faire du mal!" ("War, war, that's no reason to hurt one another!"), a line from The Dog Who Stopped the War, was used as a rallying cry of the Anti-War movement in Quebec twenty years later.
The Scrappy: In Tommy Tricker and the Stamp Traveller, many viewers hate the businessman passerby. He saw a little girl trying to post the letter with Ralph trapped in the stamp, but she's couldn't reach the mailbox because of her small height. The businessman then take the letter away from the little girl and promise to mail it for her at the post office. Once he board the bus, he eagerly opened the letter, hoping it would contained a check. Seeing nothing of value inside, he threw the envelope and letter out of the window with Ralph in tow.
The Woobie: Cleo the dog in The Dog Who Stopped the War. She spends the movie feeling miserable and upset and ends up being caught in the war when she goes to the fortress during a big snowball war and is killed when one of the walls accidentally collapses on her.
