Where There's a Will There's No Way - S1-E7
Continuity mistake: When Grace is cleaning the table with the playing cards on it, all the cards are separated in piles on the table, but in the next shot they're all in one big messy pile. Grace holds a small piles of cards, and never touches the big messy pile, then in the next shot she picks somehow up all the remaining cards in one neat pile. (01:21:05)