These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Wadsworth. In the Scarlett and Peacock endings where he's working for the FBI is he deliberately making it harder on Boddy's victims and not protecting the accomplices out of some sense of justice? In the ending where he's Mr. Boddy is he behaving the way he does throughout the movie to torment his victims?
Better on DVD: With its 3 endings, which not only heavily encourage re-watching to work out the various solutions, but also make a trip to a theater showing only one ending less satisfying, Clue seems specially designed for DVD viewing. Even though it was made almost a decade before the medium was invented.
Of course when it was released on VHS, all three endings were shown back to back like it is available on the DVD. However the DVD has the option to choose a random ending.
The way that they did it was that the multiple endings were supposed to be spread out over the movie's run, or mixed up and shown randomly... so that if you wanted to see the other two endings, you had to go see the movie again. Twice. At least.
Seeing the film again, one will notice Wadsworth's reaction to Mr. Green revealing his blackmail without letting Wadsworth out him. He's confused and checks the blackmail to see if Green's there, the blackmail unfamiliar to him and possibly planted by the FBI.
Ear Worm: "Dadadadadada! I! Am! Your singing telegram—" *BANG*
Also:"...Oh, life could be a dream (sh-boom)...If I could take you up in paradise up above (sh-boom)..."
"I said shake, rattle and roll! I said shake, rattle and roll!"
Here's my suggestion: Since this movie is so short anyway (88 minutes), why doesn't the studio abandon the ridiculous multiple-ending scheme and show all three endings at every theater? It would be more fun that way.
Magnificent Bastard: Wadsworth, the butler. In all three endings. In the first two endings Wadsworth, actually an FBI agent, set up the entire scheme in order to implicate the killer in a conspiracy and take her down. In the third ending, Wadsworth is actually Mr. Boddy and used the guests to kill off the informants who gave him everything he used to blackmail them; with each of the guests now guilty of murder and his informants all dead, he then plans to extort even more blackmail money from them.
Mr. Green in the third. He successfully passes as one of the blackmail victims and passes for a clumsy fool and homosexual. In truth, he IS the FBI agent, shoots Wadsworth when he reveals himself, has all the others arrested, then announces that he is "Going home to sleep with his wife!".