VGFacts

An ice cream cone is used as a placeholder item that displays as an elixir that has no effects and can be sold to merchants for 0 rupees.

My daughter accidentally found this out and I decided to do some research. I also looked through the official Piggyback guidebook and did not see it. 



https://www.reddit.com/r/Breath_of_the_W...ice_cream/

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There is a place in the game where cel shading does not work. At the northern entrance to the Bridge of Hylia, there is a missing portion halfway up the column, and when Link climbs inside, the cel shading filters do not work.

http://m.ign.com/wikis/the-legend-of-zel...d_Glitches

Just north of Hebra Tower, a plane sticks out of the mountainside that prevents Link from climbing any higher and can only be seen from above.



http://m.ign.com/wikis/the-legend-of-zel...d_Glitches