Theres some missable chests in OoT imn the ice arrows dungeon. If you use all the keys on only the left doors, you wont be able to get in the right door to get to 2 chests because the final key is in that door. You cant get the key to open the door, and you cant open the door to get the key, so your in a mess. xD
This happened to me, and I eventually had to glitch by bombchu hovering to the key(its on a platform in the lava pit room.)