Yeah, the lil girl was cute, but it would work if she was younger, I think a kid that age would see, as Bay puts it a "giant fucking robot" instead of a lil tooth fairy, ruined a classic scene for me. And regardless, dont use the fact that she is a child to cover horrible acting.
Also, when I saw this in theaters, that is one line that had no laughs at all.
I also, when BB peed on the guy, the only problem I had with that was the speed of the cap that hit Simmons. I think his reaction woulda been more like, OUCH, and then he totally scratches the part of his head the cap didn't even touch.
Some eye lines were off.
But I didnt find any part of the movie that seemed awkward to me.