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In Super Mario World, the controllable coin plays the P-Switch music when it is active. However, if Yoshi eats the coin while it is still active, the P-Switch music will continue playing indefinitely instead of running out as usual.
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The long Fire Bars in Super Mario Bros. have a blind spot directly to their sides where they will not hurt Mario. Almost all of them are placed so that Mario can not stand in that spot, except for this Fire Bar at the end of Level 8-4 in Super Mario Bros.: The Lost Levels.
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Follow-up to the previous post: while it appears that the Super Mario Knife is indeed extremely rare, it has been confirmed that it was available for purchase in Japan. Below is a photo of the item. Thank you very much to readers @msoyu62k22 and @mamako0326 for the information!
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