The bottom right-hand edge of the now-finished painting of "the cheerleader" laying in blood, changes throughout the early scene with Isaac and Peter on the phone with Hiro. First the edge is clean and white, then with red paint dripping off, then clean again. (This even goes back to the end of the previous episode, when Peter has just finished painting, with lots of red paint running off the edge.)
In the scene where Claire meets her parents, Mr. Bennet puts his hand on Claire's back, as seen from behind. The shot changes to in front and Mr. Bennet hand is rested on his lap, he then puts his hand on Claire's back.
When Claire is talking to her "biological" parents while drinking the lemonade, we see that the pitcher is full of regular yellow lemonade but the glasses appear to be filled with pink lemonade. This is just a trick of the light and the color of the glasses. It's clearer in other shots.
As Claire's father is eavesdropping, Claire's "mother" speaks without moving her mouth.