Thank you. Finally, I have mastered the wall jump/bounce well enough to finish Turtle Rock (my finishing the three chest room of course depended on the wall bounce).
I am currently in level 5 and 6, and I manage fine on my own, appart from one point where I probably not find the principal way to make progress (i.e. without being damaged), but the likelihood of this being due to a glitch is very low.
What I guess is a glitch, however, is the apparent inability to escape from the water to the east of Canalet Castle, after jumping off the left side of the bridge in the far east there. It also seems that in the raft area (http://zeldawiki.org/File:Link%27s_Awakening_-_Rapids_Ride.png
), at one place, the stream goes upwards instead of downwards as in the above image, which means one becomes trapped at that point. Another place one can become trapped is to the right of the right-most switch in the room north-east of of the boss room in level 5.
Edit: It seems that I haven't mastered the wall jump/bounce quite yet. In the "cellar" room north-east of the boss room on the map, I always am at least one pixel (?) short, it seems, to reach the ladder.
Edit 2: And there I made it, but I would probably never be able to do it consistently. Perhaps this challenge should be moved to an optional area.
One question: I am not sure what the bow one can get at the start at level 5 is for. Nothing happens with my Start screen; there is no extra room, but the image of my initial bow is not changed.