When Peter and Noah meet the knives guy at the bank, peter and the guy
have a first assault and Peter got cut at two places on the right
cheekbone. On the second assault, his first foot kick, the cuts have moved to the left side of his face. By his second foot kick the cuts are back on the right side.
When Hiro goes back 14 years he sees the fortune Tellers tent. who's that in there? His younger self? - his younger self has not yet had his fortune read.
The dialog in Angela's vision at the sushi restaurant differs from the real one, both in words and the order in which actions occur.
Claire is starting her freshman year in college. Her roommate asks her about linear algebra. Linear algebra is not a freshman level math class. It's a junior level math class. The second class in the calculus series is a prerequisite of linear algebra.
When Peter and Hesam are in the ambulance eating clam chowder, the radio dispatcher calls out an emergency at "5th & Lexington." In New York City, 3 boroughs have thoroughfares named "Lexington" (Manhattan, Brooklyn, and Staten Island). None of these streets intersects with "5th".
Annie invites to Clair to play Guitar Hero 3, however it's visibly clear that the game is actually Guitar Hero 5.