Impossible platinum!

I whole-heartedly agree with you. And, so do most of the people who post on Gamefaq and Gamespot.

A huge amount of money and a huge amount of nice people went into making Epic Mickey 2. But, it has game-ending, inadvertent glitches. And, its development was controlled by mean-spirited designers.

In an interview, Warren Spector lied that "it is difficult but possible to get all the pins in one playthrough". We know that is not true, because you cannot even race in Autotopia until after the ending and credits. We could safely bet that he never even played the game or watched it get played.

While researching a problem I was having with "Heads Up", I found a site called "trueachievers.com" A month after Epic Mickey 2 came out, 934 competitive achievers owned the game and signed up to compete and tracked. Only 11 had finished the game -- after 1 month of competing for prizes and bragging rights.

People were quoting the Prima Guide to answer questions -- but the tracker also showed that they had not completed the quest or challenge.

I repeat, you are absolutely right in your evaluation!

There are a couple times that you may get scrap metal, and still have a chance.

Give it another try.

Make the TV sketch your active sketch.,
Walk to the wooden platform that is just left of the Bog Easy Train Station.
If you get close enough, Oswald will send a stream of electricity to the power box that is on top of the back of the wooden platform.
Drop a TV on the platform, and Gus will say the Station has power.

It may take a couple tries.

Then, go to the station master who is standing on the dock.
Talk to him, and drop a TV part way between him and the Train Station.
He will walk toward the TV and watch.

When that sketch runs out, talk to him.

Drop another TV sketch nearer to the train station.
The station master will go a little closer to the station.

Repeat.
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It may work.

Did you check your challenges, and see if it states that you have shuttered the station?
It may say: 1/4, meaning you shuttered 1 of the 4 stations.
Which would mean that it is too late.

I totally agree with “TrulySilentLie”
Proof that what “KingDarian” says about, “Actually, it's possible to do everything in one playthrough” is not true, is that playing the “EPILOGUE” takes so much time.
KingDarian writes: “W2.5 Epilogue: After defeating The Mad Doctor, there are still a few things to do in Wasteland. Wrap up any quests you have yet to finish, and find a few new tasks to complete.” Then, he has pages of things to do that can not be done during the first playthrough.

Actually, the pitfall that I originally started to write about is that Hidden Heroes are another problem:

There are 3 episodes in which to take the photographs, plus, the “wildcard” area of Mean Street and Undergrounds that can be used for any episode.

Episode 1, from OsTown to the first Boss has enough heroes to fill your quota.
Take them back to Seth who is under/behind the Mean Street South Train Station.

Episode 2, from Bog Easy to the second Boss has enough heroes to fill your quota.
Take them back to Seth who is under/behind the Mean Street South Train Station.

Episode 3, from Ventureland to the last Boss DOES NOT have enough heroes to fill your quota. If you used too many of the Hidden Heroes on Mean Street and the Underground, you cannot complete your quest.
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I was doing Hidden Oswalds, and knew that there are only 2 Hidden Oswalds in Episode 3, and I needed 7. So, when I was doing the other episodes, I did not use the two train station ones in OsTown, and the one train station one in Bog Easy. Just as I suspected, those Hidden Oswalds could not be used for my Episode 3 quota.
Luckily, I had planned ahead, and saved all the Heroes on Mean Street and Undergrounds.

BUT, I bought a Prima Guide two weeks after I bought the game, and, if anyone follows the guide and clicks on those Hidden Heroes before the end of the game, they do not get the Quest – ever !!!

Same goes for other Walkthroughs and Guides that advise you to take the easy pictures on Mean Street, and use items like "Part 79-B" to fix a transportation tube, before you turn in 20 items to the museum for a "One Toon's Trash" credit. (After you get credit for the quest, you can buy back the stuff at a 50% mark-up. ) (Stuff from the sky does not count on that quest, but is a separate quest.)