The one where Monty trips over a cord and opens a random door seems wrong to me. According to the explanation Monty doesn't give you additional information by accidentally revealing a goat, but it seems to me he gives exactly the same amount of information as he would by intentionally revealing a goat.
And the reasoning remains the same - when you pick a door you have 1/3 chance to pick the car, meaning the two other doors have a 2/3 chance to contain it. When he reveals a goat, my door is still 1/3 and the other one is still 2/3, so I should switch just like when he intentionally reveals the goat.
And the reasoning remains the same - when you pick a door you have 1/3 chance to pick the car, meaning the two other doors have a 2/3 chance to contain it. When he reveals a goat, my door is still 1/3 and the other one is still 2/3, so I should switch just like when he intentionally reveals the goat.