The Entrance Animation Transfer (EAT) is a glitch that allows you to carry over the animation of exiting a door or location to where your file is saved. Due to there being no collision checks for walls during the animations you can clip through them, saving time in multiple areas.
To perform the Entrance Animation Transfer you need to meet 2 conditions.
Once these two conditions are met you need to perform the trick. In steps you must
If done correctly you will have successfully performed EAT.
In the Lanayru Mining Facility room in Sky Keep you can perform EAT to skip the entire room.
In order to perform this trick you must - Enter the LMF room WITHOUT getting an autosave from a statue in Sky Keep (You cannot use the skyview room shortcut for convenience as the autosave trigger is completely surrounding the shortcut.
Perform the setup shown in the video to get a correct autosave position
Die on the spiked fence, quit at the prompt
Reload the autosave file
Die again (collect arrows), continue at prompt.
If done successfully you will have skipped the room, now complete the arrow shooting and you are done.
If you get an autosave elsewhere in Sky Keep it is best to simply do the LMF room as normal, as the trick only saves a total of 12 seconds.
The Ancient Cistern has another EAT clip possible. By storing the animation of leaving a pipe you can clip OoB and get to the OoB collision under ancient Cistern, to reach the basement early.
In order to perform this clip you must
Exit the pipe from the basement to the upper floors without getting an autosave from a statue.
Go the the entrance statue(Spot shown in vid), and die
Quit and reload autosave file
die again, continue
Hold A and swim down left to stay OoB, swim to the OoB ground. Maneuver through the Cistern OoB, climb the rope to reach the basement.
Similarly to the LMF room clip, if you get an autosave from a statue it is best to resume the dungeon normally. As this trick saves about 20 seconds.
Here are some backups if you fail EAT in a way
If you get an autosave from a statue you must reload your autosave and leave the area you are currently in. From there you must navigate back to the entrance you need for the trick to try it again.
If you clip back in bounds after the AC clip you can simply die and try again, if you softlock go to the home menu, reload your autosave, and then die and try again.