Normally when you give the wrong item it just triggers a specific dialogue. I tried it and nothing special happened. Did you click on the inventory icon after clicking on the give item button?
Btw the characters don't all have names. Here are all the names I gave them, try to find who is who: ShrodCat, botanist, knight, ticket guy, robot, reader, trapped spirits, happy mask, sad mask and Jackbox. Sir Elrick is the only one with a real name.