Plot hole: After Hannigan feels guilty for what she did, she confesses to the girls, and they find Mr. Stacks to tell him. The fact is, they went straight to where he worked - but Annie never told them the destination, and Guy himself never told Hannigan where it was either. So, how did they get there, and most importantly, know where it was?
Continuity mistake: When Hannigan throws the Annie shirt at Lou he picks it up in one hand and moves it to the other hand which he lifts up in the next shot but when he does it is either in the original hand and out of frame or else completely disappeared.
Answer: Probably steak and tomatoes. But there's really no indication which ones she actually knew (and might have been exaggerating).
Bishop73