LÖVE

In LOVE 0.5.0. if I attempted to say, run function foo() in function bar() but foo wasn't a function, LOVE would tell me with a blue screen that the function on line x didn't exist. With LOVE 0.6.0. it says nothing, and continues to run but has some drawing problems (it skips the rest of the code past that point). This is bad, because I need to find where my error is.

That is odd. You might want to add it to the bug tracker (http://love2d.org/forum/tracker.php?p=1), adding more detailed information such as your platform, providing an example file, etc. I don't have this problem, nor have I heard of anyone else having this.