Willy jumping the wall!!
(Sorry, I couldn't get the video to link right into this entry)
What Doesn't Make Sense
Ok, so my dad builds boats for a living. I spent many of my summer days with my dad at marinas very similar to the one that Willy escapes from. The wall that Willy jumps over is a marine retaining wall, also called a breakwater. I played on these all the time when I was younger.
The wall itself isn't like a straight up-and-down, vertical barrier, but essentially a hill submerged in the water. The point of it is to act like a beach and break the surf outside of the marina in order to protect the boats inside. The wall pictured below is pretty close to the one in the movie.
Notice how wide the structure is? And how tall it is? You can see it in the video I posted above, around the :15 mark.
Now, I'm not a zoologist. But I think it's safe to say that a wall that size would be hard for a whale to jump over, especially because there is neither the space nor depth for Willy to get a good run at it. I'm sure if he had lots of space to do it, he probably could. But this is a harbor. The water isn't that deep, as it's close to shore.
So, it is not just a lack of logic, but it goes against the law of physics. There is no way that Willy could jump over that wall to escape. Unless he had rockets under his flippers, it's just not possible. Sorry kids, in real life, Willy would totally be re-captured and returned to his shoebox tank.
Once again, my childhood memories are being crushed with every passing minute....