Thanks! Actually, my Spanish teacher changed the verb I had for find (I forgot what it was) to hallar. And some of the stuff I know is worded oddly, but only because we're learning the present tense subjunctive and don't know how to do past tense.

In that first phrase my teacher had told me that 'perdieron' was wrong and I finally figured out that I had conjugated it wrong this morning.

For the phrase that you found confusing (¿Quién ese? No conozco él. ¡Pero está aspontoso!) the character sees someone else and says he doesn't know him.

Thanks again! That was really helpful. =]