Hard Candy

Jeff's facial hair is noticeably thicker in the opening coffee shop scene than it is later in the day.

While Jeff is tied to the table you can clearly see the padding in his socks where the ropes are tied.

Hayley isn't seen changing the ice, yet the bag appears full when ever lifted without the bottom being dominated by melted ice (better known as water), also for as long as the ice had been sitting on his lap, you would think that there would be a distinct discoloration, but there isn't.

When Jeff jumps off the roof, the rope is seen in front of his body, but when it pans out and you see the silhouette, it is behind his body.

When Jeff is struggling to get the bonds off when he is on the castration table, his hands and wrists are all red and there are heavy red marks all over his wrists.

When Jeff confronts Hayley and he falls down (on the roof), his wrists are completely clean and no marks are seen at all.

When Hayley and Jeff are struggling on the roof in the final scene, the roof appears to be reflecting mid-afternoon sunlight but moments later Jeff is in silhouette against the sunset.